diff --git a/index.html b/index.html
index ef9ea77..9c5ceaf 100644
--- a/index.html
+++ b/index.html
@@ -3,7 +3,7 @@
 	<head>
 		<meta charset="utf-8" />
 		<title>Packaged Web Publications</title>
-		<script src="https://www.w3.org/Tools/respec/respec-w3c-common" class="remove"></script>
+		<script src="https://www.w3.org/Tools/respec/respec-w3c-common" async class="remove"></script>
 		<script src="common/js/biblio.js" class="remove"></script>
 		<link href="common/css/common.css" rel="stylesheet" type="text/css" />
 		<script class="remove">
