diff --git a/lib/cc/engine/csslint.rb b/lib/cc/engine/csslint.rb
index c7a9980..0eecfc4 100644
--- a/lib/cc/engine/csslint.rb
+++ b/lib/cc/engine/csslint.rb
@@ -55,7 +55,7 @@ def csslint_xml
       end
 
       def files
-        Dir.glob("**/*css")
+        Dir.glob("**/*.css")
       end
     end
   end