--- lib/sass/plugin/configuration.rb.orig	2011-07-22 11:15:09.637534542 -0400
+++ lib/sass/plugin/configuration.rb	2011-07-22 11:15:20.787619673 -0400
@@ -2,6 +2,8 @@
 # so that we can load it independently in Rails 3,
 # where the full plugin stuff is lazy-loaded.
 
+require 'sass/cache_stores'
+
 module Sass
   module Plugin
     module Configuration