diff --git a/manifest.json b/manifest.json
index 923a21c..940f491 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,5 +15,5 @@
       "js": ["perfContentScript.js"],
       "run_at": "document_start"
     }
-  ]
+  ]<core-polymer>
 }