diff --git a/lib/utils/debounce.html b/lib/utils/debounce.html
index 8344af328f..1507faa20a 100644
--- a/lib/utils/debounce.html
+++ b/lib/utils/debounce.html
@@ -113,6 +113,7 @@
     }
   }
 
+  /** @const */
   Polymer.Debouncer = Debouncer;
 })();
 </script>