diff --git a/docs/js/navbar-search.js b/docs/js/navbar-search.js
index bbf32c4318e..9009ba1ba21 100644
--- a/docs/js/navbar-search.js
+++ b/docs/js/navbar-search.js
@@ -1,3 +1,5 @@
+var defaultVersion = '6.x';
+
 (function() {
   var versionFromUrl = window.location.pathname.match(/^\/docs\/(\d+\.x)/);
   var version = versionFromUrl ? versionFromUrl[1] : defaultVersion;