diff --git a/polymer.json b/polymer.json
index ddbc1b76..5a681dd8 100644
--- a/polymer.json
+++ b/polymer.json
@@ -7,7 +7,8 @@
   "extraDependencies": [
     "manifest.json",
     "node_modules/@webcomponents/webcomponentsjs/*.js",
-    "!node_modules/@webcomponents/webcomponentsjs/gulpfile.js"
+    "!node_modules/@webcomponents/webcomponentsjs/gulpfile.js",
+    "node_modules/@webcomponents/webcomponentsjs/bundles/*.js"
   ],
   "builds": [
     {