diff --git a/lib/compass/css3/_images.scss b/lib/compass/css3/_images.scss
index cb7983c..19c27b4 100644
--- a/lib/compass/css3/_images.scss
+++ b/lib/compass/css3/_images.scss
@@ -1,5 +1,6 @@
 @import "shared";
 @import "../utilities/general/hacks";
+@import "../functions";
 
 // Background property support for vendor prefixing within values.
 @mixin background(