diff --git a/src/templates/index.html b/src/templates/index.html
index 9fd33a26..961c6012 100644
--- a/src/templates/index.html
+++ b/src/templates/index.html
@@ -41,7 +41,7 @@
               if(language) document.documentElement.lang = language[1];
             })(document)
         </script>
-        <script type="text/javascript" src="static/js/l10n.js" async></script>
+        <script type="text/javascript" src="static/js/l10n.js"></script>
 
         <style>
             html, body {