diff --git a/lib/compass/css3/_appearance.scss b/lib/compass/css3/_appearance.scss
index e238f01..87c7251 100644
--- a/lib/compass/css3/_appearance.scss
+++ b/lib/compass/css3/_appearance.scss
@@ -11,6 +11,6 @@
 @mixin appearance($ap) {
   $ap: unquote($ap);
   @include experimental(appearance, $ap,
-    -moz, -webkit, not -o, not -ms, not -khtml, official
+    -moz, -webkit, not(-o), not(-ms), not(-khtml), official
   );
 }
diff --git a/lib/compass/css3/_background-clip.scss b/lib/compass/css3/_background-clip.scss
index 6ce473f..3c05ee5 100644
--- a/lib/compass/css3/_background-clip.scss
+++ b/lib/compass/css3/_background-clip.scss
@@ -27,16 +27,16 @@ $default-background-clip: padding-box !default;
   @include experimental(background-clip, $deprecated,
     -moz,
     -webkit,
-    not -o,
-    not -ms,
-    not -khtml,
+    not(-o),
+    not(-ms),
+    not(-khtml),
     not official
   );
   @include experimental(background-clip, $clip,
-    not -moz,
-    not -webkit,
-    not -o,
-    not -ms,
+    not(-moz),
+    not(-webkit),
+    not(-o),
+    not(-ms),
     -khtml,
     official
   );
diff --git a/lib/compass/css3/_background-origin.scss b/lib/compass/css3/_background-origin.scss
index bc8eaa8..eefd262 100644
--- a/lib/compass/css3/_background-origin.scss
+++ b/lib/compass/css3/_background-origin.scss
@@ -26,14 +26,14 @@ $default-background-origin: content-box !default;
   @include experimental(background-origin, $deprecated,
     -moz,
     -webkit,
-    not -o,
-    not -ms,
-    not -khtml,
+    not(-o),
+    not(-ms),
+    not(-khtml),
     not official
   );
   @include experimental(background-origin, $origin,
-    not -moz,
-    not -webkit,
+    not(-moz),
+    not(-webkit),
     -o,
     -ms,
     -khtml,
diff --git a/lib/compass/css3/_background-size.scss b/lib/compass/css3/_background-size.scss
index 9d36447..5e46ae3 100644
--- a/lib/compass/css3/_background-size.scss
+++ b/lib/compass/css3/_background-size.scss
@@ -22,5 +22,5 @@ $default-background-size: 100% auto !default;
 ) {
   $size-1: if(type-of($size-1) == string, unquote($size-1), $size-1);
   $sizes: compact($size-1, $size-2, $size-3, $size-4, $size-5, $size-6, $size-7, $size-8, $size-9, $size-10);
-  @include experimental(background-size, $sizes, -moz, -webkit, -o, not -ms, not -khtml);
+  @include experimental(background-size, $sizes, -moz, -webkit, -o, not(-ms), not(-khtml));
 }
diff --git a/lib/compass/css3/_border-radius.scss b/lib/compass/css3/_border-radius.scss
index 2da9022..3bfd041 100644
--- a/lib/compass/css3/_border-radius.scss
+++ b/lib/compass/css3/_border-radius.scss
@@ -42,18 +42,18 @@ $default-border-radius: 5px !default;
     // Webkit doesn't understand the official shorthand syntax for specifying
     // a vertical radius unless so in case there's several we only take the first.
     @include experimental(border-radius, first-value-of($radius) first-value-of($vertical-radius),
-      not -moz,
+      not(-moz),
       -webkit,
-      not -o,
-      not -ms,
-      not -khtml,
+      not(-o),
+      not(-ms),
+      not(-khtml),
       not official
     );
     @include experimental("border-radius", $radius unquote("/") $vertical-radius,
       -moz,
-      not -webkit,
-      not -o,
-      not -ms,
+      not(-webkit),
+      not(-o),
+      not(-ms),
       -khtml,
       official
     );
@@ -72,17 +72,17 @@ $default-border-radius: 5px !default;
   // Support for mozilla's syntax for specifying a corner
   @include experimental("border-radius-#{$vert}#{$horz}", $radius,
     -moz,
-    not -webkit,
-    not -o,
-    not -ms,
-    not -khtml,
+    not(-webkit),
+    not(-o),
+    not(-ms),
+    not(-khtml),
     not official
   );
   @include experimental("border-#{$vert}-#{$horz}-radius", $radius,
-    not -moz,
+    not(-moz),
     -webkit,
-    not -o,
-    not -ms,
+    not(-o),
+    not(-ms),
     -khtml,
     official
   );
diff --git a/lib/compass/css3/_box-shadow.scss b/lib/compass/css3/_box-shadow.scss
index ea47dc9..7e43836 100644
--- a/lib/compass/css3/_box-shadow.scss
+++ b/lib/compass/css3/_box-shadow.scss
@@ -45,7 +45,7 @@ $default-box-shadow-inset : false !default;
   }
   $shadow : compact($shadow-1, $shadow-2, $shadow-3, $shadow-4, $shadow-5, $shadow-6, $shadow-7, $shadow-8, $shadow-9, $shadow-10);
   @include experimental(box-shadow, $shadow,
-    -moz, -webkit, not -o, not -ms, not -khtml, official
+    -moz, -webkit, not(-o), not(-ms), not(-khtml), official
   );
 }
 
diff --git a/lib/compass/css3/_box-sizing.scss b/lib/compass/css3/_box-sizing.scss
index 93ff8ac..f75a783 100644
--- a/lib/compass/css3/_box-sizing.scss
+++ b/lib/compass/css3/_box-sizing.scss
@@ -8,6 +8,6 @@
 @mixin box-sizing($bs) {
   $bs: unquote($bs);
   @include experimental(box-sizing, $bs,
-    -moz, -webkit, not -o, not -ms, not -khtml, official
+    -moz, -webkit, not(-o), not(-ms), not(-khtml), official
   );
 }
diff --git a/lib/compass/css3/_box.scss b/lib/compass/css3/_box.scss
index 959ccff..eac53c9 100644
--- a/lib/compass/css3/_box.scss
+++ b/lib/compass/css3/_box.scss
@@ -3,7 +3,7 @@
 // display:box; must be used for any of the other flexbox mixins to work properly
 @mixin display-box {
   @include experimental-value(display, box,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -16,7 +16,7 @@ $default-box-orient: horizontal !default;
 ) {
   $orientation : unquote($orientation);
   @include experimental(box-orient, $orientation,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -29,7 +29,7 @@ $default-box-align: stretch !default;
 ) {
   $alignment : unquote($alignment);
   @include experimental(box-align, $alignment,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -43,7 +43,7 @@ $default-box-flex: 0 !default;
   $flex: $default-box-flex
 ) {
   @include experimental(box-flex, $flex,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -55,7 +55,7 @@ $default-box-flex-group: 1 !default;
   $group: $default-box-flex-group
 ) {
   @include experimental(box-flex-group, $group,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -67,7 +67,7 @@ $default-box-ordinal-group: 1 !default;
   $group: $default-ordinal-flex-group
 ) {
   @include experimental(box-ordinal-group, $group,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -80,7 +80,7 @@ $default-box-direction: normal !default;
 ) {
   $direction: unquote($direction);
   @include experimental(box-direction, $direction,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -93,7 +93,7 @@ $default-box-lines: single !default;
 ) {
   $lines: unquote($lines);
   @include experimental(box-lines, $lines,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
 
@@ -106,6 +106,6 @@ $default-box-pack: start !default;
 ) {
   $pack: unquote($pack);
   @include experimental(box-pack, $pack,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not(-o), -ms, not(-khtml), official
   );
 }
\ No newline at end of file
diff --git a/lib/compass/css3/_columns.scss b/lib/compass/css3/_columns.scss
index 9af9982..b7a6a57 100644
--- a/lib/compass/css3/_columns.scss
+++ b/lib/compass/css3/_columns.scss
@@ -7,35 +7,35 @@
 //     @include columns(20em 2)
 @mixin columns($width-and-count) {
   @include experimental(columns, $width-and-count,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
 // Specify the number of columns
 @mixin column-count($count) {
   @include experimental(column-count, $count,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
 // Specify the gap between columns e.g. `20px`
 @mixin column-gap($width) {
   @include experimental(column-gap, $width,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
 // Specify the width of columns e.g. `100px`
 @mixin column-width($width) {
   @include experimental(column-width, $width,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
 // Specify the width of the rule between columns e.g. `1px`
 @mixin column-rule-width($width) {
   @include experimental(column-rule-width, $width,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -43,7 +43,7 @@
 // This works like border-style.
 @mixin column-rule-style($style) {
   @include experimental(column-rule-style, unquote($style),
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -51,7 +51,7 @@
 // This works like border-color.
 @mixin column-rule-color($color) {
   @include experimental(column-rule-color, $color,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -66,7 +66,7 @@
 @mixin column-rule($width, $style: false, $color: false) {
   $full : -compass-space-list(compact($width, $style, $color));
   @include experimental(column-rule, $full,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -83,7 +83,7 @@
 //    -webkit-column-break-before: always;
 //    column-break-before: always;}
 @mixin column-break-before($value: auto){
-   @include experimental(column-break-before, $value, not -moz, -webkit, not -o, not -ms, not -khtml, official );
+   @include experimental(column-break-before, $value, not(-moz), -webkit, not(-o), not(-ms), not(-khtml), official );
 }
 
 // Mixin for setting column-break-after
@@ -99,7 +99,7 @@
 //    -webkit-column-break-after: always;
 //    column-break-after: always; }
 @mixin column-break-after($value: auto){
-   @include experimental(column-break-after, $value, not -moz, -webkit, not -o, not -ms, not -khtml, official );
+   @include experimental(column-break-after, $value, not(-moz), -webkit, not(-o), not(-ms), not(-khtml), official );
 }
 
 // Mixin for setting column-break-inside
@@ -114,7 +114,7 @@
 //    -webkit-column-break-inside: auto;
 //    column-break-inside: auto;}
 @mixin column-break-inside($value: auto){
-   @include experimental(column-break-inside, $value, not -moz, -webkit, not -o, not -ms, not -khtml, official );
+   @include experimental(column-break-inside, $value, not(-moz), -webkit, not(-o), not(-ms), not(-khtml), official );
 }
 
 // All-purpose mixin for setting column breaks.
@@ -144,5 +144,5 @@
 //    column-break-inside: auto;}
  
 @mixin column-break($type: before, $value: auto){
-   @include experimental("column-break-#{$type}", $value, not -moz, -webkit, not -o, not -ms, not -khtml, official );
+   @include experimental("column-break-#{$type}", $value, not(-moz), -webkit, not(-o), not(-ms), not(-khtml), official );
 }
\ No newline at end of file
diff --git a/lib/compass/css3/_filter.scss b/lib/compass/css3/_filter.scss
index cd6eb19..c4d8caa 100644
--- a/lib/compass/css3/_filter.scss
+++ b/lib/compass/css3/_filter.scss
@@ -18,6 +18,6 @@
 ) {
   $filter : compact($filter-1, $filter-2, $filter-3, $filter-4, $filter-5, $filter-6, $filter-7, $filter-8, $filter-9, $filter-10);
   @include experimental(filter, $filter,
-    -moz, -webkit, not -o, not -ms, not -khtml, official
+    -moz, -webkit, not(-o), not(-ms), not(-khtml), official
   );
 }
diff --git a/lib/compass/css3/_hyphenation.scss b/lib/compass/css3/_hyphenation.scss
index a4f5808..5a76586 100644
--- a/lib/compass/css3/_hyphenation.scss
+++ b/lib/compass/css3/_hyphenation.scss
@@ -21,16 +21,16 @@
   @if $value == break-all {
     //Most browsers handle the break-all case the same...
     @include experimental(word-break, $value,
-      not -moz, not -webkit, not -o, -ms, not -khtml, official
+      not(-moz), not(-webkit), not(-o), -ms, not(-khtml), official
     );
     //Webkit handles break-all differently... as break-word
     @include experimental(word-break, break-word,
-      not -moz, not -webkit, not -o, not -ms, not -khtml, official
+      not(-moz), not(-webkit), not(-o), not(-ms), not(-khtml), official
     );
   }
   @else {
     @include experimental(word-break, $value,
-      not -moz, not -webkit, not -o, -ms, not -khtml, official
+      not(-moz), not(-webkit), not(-o), -ms, not(-khtml), official
     );
   }
 }
@@ -51,7 +51,7 @@
 //
 @mixin hyphens($value: auto){
   @include experimental(hyphens, $value,
-    -moz, -webkit, not -o, not -ms, not -khtml, official
+    -moz, -webkit, not(-o), not(-ms), not(-khtml), official
   );
 }
 
diff --git a/lib/compass/css3/_images.scss b/lib/compass/css3/_images.scss
index 18cdc16..cb7983c 100644
--- a/lib/compass/css3/_images.scss
+++ b/lib/compass/css3/_images.scss
@@ -43,7 +43,7 @@
                         $background-6, $background-7, $background-8, $background-9, $background-10);
   $mult-bgs: -compass-list-size($backgrounds) > 1;
   $simple-background: if($mult-bgs or prefixed(-css2, $backgrounds), -css2(-compass-nth($backgrounds, last)), false);
-  @if not blank($simple-background) { background: $simple-background; }
+  @if not(blank($simple-background)) { background: $simple-background; }
   @include background($background-1, $background-2, $background-3, $background-4, $background-5,
                       $background-6, $background-7, $background-8, $background-9, $background-10);
 }
diff --git a/lib/compass/css3/_regions.scss b/lib/compass/css3/_regions.scss
index 9b2f27c..1cd623f 100644
--- a/lib/compass/css3/_regions.scss
+++ b/lib/compass/css3/_regions.scss
@@ -10,13 +10,13 @@
 @mixin flow-into($target) {
   $target: unquote($target);
   @include experimental(flow-into, $target,
-    not -moz, -webkit, not -o, -ms, not -khtml, not official
+    not(-moz), -webkit, not(-o), -ms, not(-khtml), not official
   );
 }
 
 @mixin flow-from($target) {
   $target: unquote($target);
   @include experimental(flow-from, $target,
-    not -moz, -webkit, not -o, -ms, not -khtml, not official
+    not(-moz), -webkit, not(-o), -ms, not(-khtml), not official
   );
 }
\ No newline at end of file
diff --git a/lib/compass/css3/_transform-legacy.scss b/lib/compass/css3/_transform-legacy.scss
index ac661da..3af4795 100644
--- a/lib/compass/css3/_transform-legacy.scss
+++ b/lib/compass/css3/_transform-legacy.scss
@@ -8,7 +8,7 @@
 
 @mixin apply-transform($transform) {
   @include experimental(transform, $transform,
-    -moz, -webkit, -o, not -ms, not -khtml, official
+    -moz, -webkit, -o, not(-ms), not(-khtml), official
   );
 }
 
@@ -16,7 +16,7 @@
 
 @mixin apply-origin($origin) {
   @include experimental(transform-origin, $origin,
-    -moz, -webkit, -o, not -ms, not -khtml, official
+    -moz, -webkit, -o, not(-ms), not(-khtml), official
   );
 }
 
diff --git a/lib/compass/css3/_transform.scss b/lib/compass/css3/_transform.scss
index ecd50b7..20a5ad6 100644
--- a/lib/compass/css3/_transform.scss
+++ b/lib/compass/css3/_transform.scss
@@ -104,11 +104,11 @@ $default-skew-y      : 5deg                  !default;
   $only3d: $only3d or -compass-list-size(-compass-list($origin)) > 2;
   @if $only3d {
     @include experimental(transform-origin, $origin,
-      -moz, -webkit, -o, -ms, not -khtml, official
+      -moz, -webkit, -o, -ms, not(-khtml), official
     );
   } @else {
     @include experimental(transform-origin, $origin,
-      -moz, -webkit, -o, -ms, not -khtml, official
+      -moz, -webkit, -o, -ms, not(-khtml), official
     );
   }
 }
@@ -147,11 +147,11 @@ $default-skew-y      : 5deg                  !default;
 ) {
   @if $only3d {
     @include experimental(transform, $transform,
-      -moz, -webkit, -o, -ms, not -khtml, official
+      -moz, -webkit, -o, -ms, not(-khtml), official
     );
   } @else {
     @include experimental(transform, $transform,
-      -moz, -webkit, -o, -ms, not -khtml, official
+      -moz, -webkit, -o, -ms, not(-khtml), official
     );
   }
 }
@@ -179,7 +179,7 @@ $default-skew-y      : 5deg                  !default;
 // values from 500 to 1000 are more-or-less "normal" - a good starting-point.
 @mixin perspective($p) {
   @include experimental(perspective, $p,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -190,7 +190,7 @@ $default-skew-y      : 5deg                  !default;
 // where the two arguments represent x/y coordinates
 @mixin perspective-origin($origin: 50%) {
   @include experimental(perspective-origin, $origin,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -202,7 +202,7 @@ $default-skew-y      : 5deg                  !default;
 // Browsers default to `flat`, mixin defaults to `preserve-3d`.
 @mixin transform-style($style: preserve-3d) {
   @include experimental(transform-style, $style,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
@@ -214,7 +214,7 @@ $default-skew-y      : 5deg                  !default;
 // Browsers default to visible, mixin defaults to hidden
 @mixin backface-visibility($visibility: hidden) {
   @include experimental(backface-visibility, $visibility,
-    -moz, -webkit, -o, -ms, not -khtml, official
+    -moz, -webkit, -o, -ms, not(-khtml), official
   );
 }
 
diff --git a/lib/compass/css3/_transition.scss b/lib/compass/css3/_transition.scss
index 4c4cb8c..14c6e67 100644
--- a/lib/compass/css3/_transition.scss
+++ b/lib/compass/css3/_transition.scss
@@ -68,7 +68,7 @@ $transitionable-prefixed-values: transform, transform-origin !default;
   @if type-of($duration-1) == string { $duration-1: unquote($duration-1); }
   $durations: compact($duration-1, $duration-2, $duration-3, $duration-4, $duration-5, $duration-6, $duration-7, $duration-8, $duration-9, $duration-10);
   @include experimental(transition-duration, $durations,
-    -moz, -webkit, -o, not -ms, not -khtml, official
+    -moz, -webkit, -o, not(-ms), not(-khtml), official
   );
 }
 
@@ -92,7 +92,7 @@ $transitionable-prefixed-values: transform, transform-origin !default;
   $function-1: unquote($function-1);
   $functions: compact($function-1, $function-2, $function-3, $function-4, $function-5, $function-6, $function-7, $function-8, $function-9, $function-10);
   @include experimental(transition-timing-function, $functions,
-    -moz, -webkit, -o, not -ms, not -khtml, official
+    -moz, -webkit, -o, not(-ms), not(-khtml), official
   );
 }
 
@@ -115,7 +115,7 @@ $transitionable-prefixed-values: transform, transform-origin !default;
   @if type-of($delay-1) == string { $delay-1: unquote($delay-1); }
   $delays: compact($delay-1, $delay-2, $delay-3, $delay-4, $delay-5, $delay-6, $delay-7, $delay-8, $delay-9, $delay-10);
   @include experimental(transition-delay, $delays,
-    -moz, -webkit, -o, not -ms, not -khtml, official
+    -moz, -webkit, -o, not(-ms), not(-khtml), official
   );
 }
 
@@ -214,7 +214,7 @@ $transitionable-prefixed-values: transform, transform-origin !default;
 // Checks if the value given is a unit of time.
 @function is-time($value) {
   @if type-of($value) == number {
-    @return not not index(s ms, unit($value));
+    @return not(not(index(s ms, unit($value))));
   } @else {
     @return false;
   }
diff --git a/lib/compass/css3/_user-interface.scss b/lib/compass/css3/_user-interface.scss
index e78b2fe..5f41752 100644
--- a/lib/compass/css3/_user-interface.scss
+++ b/lib/compass/css3/_user-interface.scss
@@ -12,6 +12,6 @@
 @mixin user-select($select) {
   $select: unquote($select);
   @include experimental(user-select, $select,
-    -moz, -webkit, not -o, not -ms, -khtml, official
+    -moz, -webkit, not(-o), not(-ms), -khtml, official
   );
 }
diff --git a/lib/compass/typography/_vertical_rhythm.scss b/lib/compass/typography/_vertical_rhythm.scss
index baef446..066af3c 100644
--- a/lib/compass/typography/_vertical_rhythm.scss
+++ b/lib/compass/typography/_vertical_rhythm.scss
@@ -46,10 +46,10 @@ $base-half-leader: $base-leader / 2;
 
 // True if a number has an absolute unit.
 @function absolute-unit($number) {
-  @return not (relative-unit($number) or unitless($number));
+  @return not(relative-unit($number) or unitless($number));
 }
 
-@if $relative-font-sizing and not relative-unit($font-unit) {
+@if $relative-font-sizing and not(relative-unit($font-unit)) {
   @warn "$relative-font-sizing is true but $font-unit is set to #{$font-unit} which is not a relative unit.";
 }
 
@@ -93,7 +93,7 @@ $base-half-leader: $base-leader / 2;
 // defaults to the smallest integer that is large enough to fit the font.
 // Use $from-size to adjust from a font-size other than the base font-size.
 @mixin adjust-font-size-to($to-size, $lines: lines-for-font-size($to-size), $from-size: $base-font-size) {
-  @if not $relative-font-sizing and $from-size != $base-font-size {
+  @if not($relative-font-sizing) and $from-size != $base-font-size {
     @warn "$relative-font-sizing is false but a relative font size was passed to adjust-font-size-to";
   }
   font-size: $font-unit * $to-size / $from-size;
@@ -114,7 +114,7 @@ $base-half-leader: $base-leader / 2;
   $font-size: $base-font-size,
   $offset: 0
 ) {
-  @if not $relative-font-sizing and $font-size != $base-font-size {
+  @if not($relative-font-sizing) and $font-size != $base-font-size {
     @warn "$relative-font-sizing is false but a relative font size was passed to the rhythm function";
   }
   $rhythm: $font-unit * ($lines * $base-line-height - $offset) / $font-size;
@@ -177,7 +177,7 @@ $base-half-leader: $base-leader / 2;
 // Apply a border and whitespace to any side without destroying the vertical
 // rhythm. The whitespace must be greater than the width of the border.
 @mixin apply-side-rhythm-border($side, $width: 1px, $lines: 1, $font-size: $base-font-size, $border-style: $default-rhythm-border-style) {
-  @if not $relative-font-sizing and $font-size != $base-font-size {
+  @if not($relative-font-sizing) and $font-size != $base-font-size {
     @warn "$relative-font-sizing is false but a relative font size was passed to apply-side-rhythm-border";
   }
   border-#{$side}: {
@@ -189,7 +189,7 @@ $base-half-leader: $base-leader / 2;
 
 // Apply borders and whitespace equally to all sides.
 @mixin rhythm-borders($width: 1px, $lines: 1, $font-size: $base-font-size, $border-style: $default-rhythm-border-style) {
-  @if not $relative-font-sizing and $font-size != $base-font-size {
+  @if not($relative-font-sizing) and $font-size != $base-font-size {
     @warn "$relative-font-sizing is false but a relative font size was passed to rhythm-borders";
   }
   border: {
diff --git a/lib/compass/typography/text/_ellipsis.scss b/lib/compass/typography/text/_ellipsis.scss
index d380afb..04de955 100644
--- a/lib/compass/typography/text/_ellipsis.scss
+++ b/lib/compass/typography/text/_ellipsis.scss
@@ -12,11 +12,11 @@ $use-mozilla-ellipsis-binding: false !default;
   @if $no-wrap { white-space: nowrap; }
   overflow: hidden;
   @include experimental(text-overflow, ellipsis,
-    not -moz,
-    not -webkit,
+    not(-moz),
+    not(-webkit),
     -o,
     -ms,
-    not -khtml,
+    not(-khtml),
     official
   );
   @if $experimental-support-for-mozilla and $use-mozilla-ellipsis-binding {
diff --git a/lib/compass/utilities/sprites/_base.scss b/lib/compass/utilities/sprites/_base.scss
index 1b268a8..ef8feb6 100644
--- a/lib/compass/utilities/sprites/_base.scss
+++ b/lib/compass/utilities/sprites/_base.scss
@@ -29,7 +29,7 @@ $disable-magic-sprite-selectors:false !default;
   @if $dimensions {
     @include sprite-dimensions($map, $sprite);
   }
-  @if not $disable-magic-sprite-selectors {
+  @if not($disable-magic-sprite-selectors) {
     @include sprite-selectors($map, $sprite, $sprite, $offset-x, $offset-y);
   }
 }