lib/sprockets/helpers/rails_helper.rb in actionpack-3.2.5 vs lib/sprockets/helpers/rails_helper.rb in actionpack-3.2.6

@@ -155,10 +155,11 @@
         end
 
         def rewrite_extension(source, dir, ext)
           source_ext = File.extname(source)
           if ext && source_ext != ".#{ext}"
-            if !source_ext.empty? && asset_environment[source]
+            if !source_ext.empty? && (asset = asset_environment[source]) &&
+                  asset.pathname.to_s =~ /#{source}\Z/
               source
             else
               "#{source}.#{ext}"
             end
           else