diff --git a/404.md b/404.md
index 9397a69c..59218627 100644
--- a/404.md
+++ b/404.md
@@ -13,5 +13,5 @@ Sorry, but the page you were trying to view does not exist --- perhaps you can t
   var GOOG_FIXURL_SITE = '{{ site.url }}'
 </script>
 <script type="text/javascript"
-  src="http://linkhelp.clients.google.com/tbproxy/lh/wm/fixurl.js">
+  src="//linkhelp.clients.google.com/tbproxy/lh/wm/fixurl.js">
 </script>
\ No newline at end of file