diff --git a/index.html b/index.html
index c3b80cde..a35b661b 100644
--- a/index.html
+++ b/index.html
@@ -19,7 +19,7 @@
   <!-- End ignore these -->
 
   <!-- Optional includes -->
-  <script src="https://cdn.polyfill.io/v2/polyfill.js?features=es5,fetch,Element.prototype.classList,requestAnimationFrame,Node.insertBefore,Node.firstChild"></script>
+  <script src="https://cdn.polyfill.io/v2/polyfill.js?features=es5,fetch,Element.prototype.classList,requestAnimationFrame,Node.insertBefore,Node.firstChild,Object.assign"></script>
   <!-- End optional includes -->
 
   <!-- Choices includes -->