diff --git a/lib/compass/_css3.scss b/lib/compass/_css3.scss
index c0c9fcc..a4aaf73 100644
--- a/lib/compass/_css3.scss
+++ b/lib/compass/_css3.scss
@@ -17,3 +17,4 @@
 @import "css3/regions";
 @import "css3/hyphenation";
 @import "css3/filter";
+@import "css3/user-interface";