diff --git a/theme/templates/index.html b/theme/templates/index.html
index 135a57a..1e50501 100644
--- a/theme/templates/index.html
+++ b/theme/templates/index.html
@@ -57,7 +57,7 @@
 
   <script type="text/javascript">
     $(document).ready(function () {
-      $('a[href^="http://"], a[href^="https://"]').attr('target', '_blank');
+      $('a[class*=external]').attr('target', '_blank');
     });
   </script>