diff --git a/lib/compass/css3/_transition.scss b/lib/compass/css3/_transition.scss
index 8573b98..6feb36c 100644
--- a/lib/compass/css3/_transition.scss
+++ b/lib/compass/css3/_transition.scss
@@ -176,9 +176,9 @@ $transitionable-prefixed-values: transform, transform-origin !default;
     // Keep a list of delays in case one is specified
     $delays: append($delays, if($delay, $delay, 0s));
 
-    $webkit-value: append($webkit-value, compact(prefixed-for-transition(-webkit, $property) $duration $timing-function));
-       $moz-value: append(   $moz-value, compact(prefixed-for-transition(   -moz, $property) $duration $timing-function $delay));
-         $o-value: append(     $o-value, compact(prefixed-for-transition(     -o, $property) $duration $timing-function $delay));
+    $webkit-value: append($webkit-value, compact((prefixed-for-transition(-webkit, $property) $duration $timing-function)...));
+       $moz-value: append(   $moz-value, compact((prefixed-for-transition(   -moz, $property) $duration $timing-function $delay)...));
+         $o-value: append(     $o-value, compact((prefixed-for-transition(     -o, $property) $duration $timing-function $delay)...));
   }
 
   @if $experimental-support-for-webkit    {       -webkit-transition : $webkit-value;
diff --git a/lib/compass/functions/_lists.scss b/lib/compass/functions/_lists.scss
index dadb5a9..e24cc80 100644
--- a/lib/compass/functions/_lists.scss
+++ b/lib/compass/functions/_lists.scss
@@ -20,6 +20,7 @@
 // compass_list can't be implemented in sass script
 
 @function -compass-space-list($item1, $item2:null, $item3:null, $item4:null, $item5:null, $item6:null, $item7:null, $item8:null, $item9:null) {
+  $items: ();
   // Support for polymorphism.
   @if type-of($item1) == 'list' {
     // Passing a single array of properties.
@@ -77,14 +78,13 @@
   @return nth($list, 1);
 }
 
-@if not(function-exists(compact)) {
-  @function compact($vars...) {
-    $list: ();
-    @each $var in $vars {
-        @if $var {
-            $list: append($list, $var, comma);
-        }
-    }
-    @return $list;
+@function compact($vars...) {
+  $separator: list-separator($vars);
+  $list: ();
+  @each $var in $vars {
+      @if $var {
+          $list: append($list, $var, $separator);
+      }
   }
+  @return $list;
 }