diff --git a/src/lib/polymer-bootstrap.html b/src/lib/polymer-bootstrap.html
index cdfc63a4..b21677b3 100644
--- a/src/lib/polymer-bootstrap.html
+++ b/src/lib/polymer-bootstrap.html
@@ -60,8 +60,6 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       return prototype.constructor;
     };
 
-    window.Polymer = Polymer;
-
     if (userPolymer) {
       for (var i in userPolymer) {
         Polymer[i] = userPolymer[i];
@@ -98,4 +96,3 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   };
 
 </script>
-