diff --git a/index.html b/index.html
index cb0f86c..f65c20a 100644
--- a/index.html
+++ b/index.html
@@ -3,7 +3,7 @@
 <head>
   <title>Payment App API</title>
     <meta charset='utf-8'>
-    <script src='https://www.w3.org/Tools/respec/respec-w3c-common' async class='remove'></script>
+    <script src='https://www.w3.org/Tools/respec/respec-w3c-common' class='remove'></script>
     <script src='utils.js' class='remove'></script>
     <script class='remove'>
         var respecConfig = {
