diff --git a/index.html b/index.html
index 1848f5b..d1b90f6 100644
--- a/index.html
+++ b/index.html
@@ -12,7 +12,7 @@
       .example pre { border: medium solid #efe7e7; background-color: #f7fff7; display: inline-block; }
     </style>
     <script src='https://www.w3.org/Tools/respec/respec-w3c-common'
-            async="async" class='remove'></script>
+            defer class='remove'></script>
 
     <script class='remove'>
       var respecConfig = {