diff --git a/test/unit/polymer-dom-content.html b/test/unit/polymer-dom-content.html
index 1a42ee37..e6d9be02 100644
--- a/test/unit/polymer-dom-content.html
+++ b/test/unit/polymer-dom-content.html
@@ -42,7 +42,11 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
 <dom-module id="x-dist-star">
   <template><content select="*"></content></template>
-  <script>Polymer({is: 'x-dist-star'});</script>
+  <script>
+  HTMLImports.whenReady(function() {
+    Polymer({is: 'x-dist-star'});
+  });
+  </script>
 </dom-module>
 
 <dom-module id="x-dist-inside-deep-tree">