diff --git a/lib/compass/typography/text/_replacement.scss b/lib/compass/typography/text/_replacement.scss
index 35e4e50..bb0e6d5 100644
--- a/lib/compass/typography/text/_replacement.scss
+++ b/lib/compass/typography/text/_replacement.scss
@@ -45,8 +45,8 @@ $hide-text-direction: left !default;
 // for your application.
 @mixin hide-text($direction: $hide-text-direction) {
   @if $direction == left {
-    $approximate-em-value: 12px / 1em;
-    $wider-than-any-screen: -9999em;
+    $approximate-em-value: 12px;
+    $wider-than-any-screen: -9999;
     text-indent: $wider-than-any-screen * $approximate-em-value;
     overflow: hidden;
     text-align: left;