diff --git a/index.html b/index.html
index 7e4638d..4405f20 100644
--- a/index.html
+++ b/index.html
@@ -53,7 +53,7 @@ <h2>Gist HTML Preview</h2>
 
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
-  <script src="https://cdn.rawgit.com/github/fetch/master/fetch.js"></script>
+  <script type="module" src="https://cdn.rawgit.com/github/fetch/master/fetch.js"></script>
   <script src="./main.js"></script>
 </body>
 </html>