diff --git a/doc-src/Gemfile.lock b/doc-src/Gemfile.lock
index a1f8d986..727b24dc 100644
--- a/doc-src/Gemfile.lock
+++ b/doc-src/Gemfile.lock
@@ -14,7 +14,7 @@ GIT
 PATH
   remote: ..
   specs:
-    compass (0.11.alpha.4.ff6c3a0)
+    compass (0.11.alpha.4.2040be4)
       chunky_png (~> 0.10.3)
       sass (>= 3.1.0.alpha.50)
 
diff --git a/lib/compass/app_integration/rails/actionpack2/urls.rb b/lib/compass/app_integration/rails/actionpack2/urls.rb
index 1847a722..9780f952 100644
--- a/lib/compass/app_integration/rails/actionpack2/urls.rb
+++ b/lib/compass/app_integration/rails/actionpack2/urls.rb
@@ -1,5 +1,5 @@
 module Compass::SassExtensions::Functions::Urls
-  def image_url_with_rails_integration(path, only_path = Sass::Script::Bool.new(false))
+  def image_url_with_rails_integration(path, only_path = Sass::Script::Bool.new(false), cache_buster = Sass::Script::Bool.new(true))
     if (@controller = Sass::Plugin.rails_controller) && @controller.respond_to?(:request) && @controller.request
       begin
         if only_path.to_bool
@@ -11,7 +11,7 @@ module Compass::SassExtensions::Functions::Urls
         @controller = nil
       end
     else
-      image_url_without_rails_integration(path)
+      image_url_without_rails_integration(path, only_path, cache_buster)
     end
   end
   alias_method_chain :image_url, :rails_integration