diff --git a/lib/compass/sass_extensions/functions/sprites.rb b/lib/compass/sass_extensions/functions/sprites.rb
index 127adc57..7fc123c9 100644
--- a/lib/compass/sass_extensions/functions/sprites.rb
+++ b/lib/compass/sass_extensions/functions/sprites.rb
@@ -1,4 +1,5 @@
-require 'md5'
+require 'digest/md5'
+
 module Compass::SassExtensions::Functions::Sprites
   ZERO = Sass::Script::Number::new(0)