diff --git a/package.json b/package.json
index a30c075a50..32f5ecfa96 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "3.3.0",
   "description": "The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to write",
   "main": "polymer-element.js",
+  "module": "polymer-element.js",
   "directories": {
     "doc": "docs",
     "test": "test"