diff --git a/lib/mixins/dir-mixin.html b/lib/mixins/dir-mixin.html
index c029ed3e37..42ff09ade3 100644
--- a/lib/mixins/dir-mixin.html
+++ b/lib/mixins/dir-mixin.html
@@ -79,6 +79,7 @@
      * @memberof Polymer
      */
     Polymer.DirMixin = Polymer.dedupingMixin((base) => {
+      return base;
 
       if (!observer) {
         getRTL();