diff --git a/grunt/configBridge.json b/grunt/configBridge.json
index 84ff71872..78e7aae57 100644
--- a/grunt/configBridge.json
+++ b/grunt/configBridge.json
@@ -34,6 +34,7 @@
     ],
     "jqueryVersionCheck": [
       "+function ($) {",
+      "  'use strict';",
       "  var version = $.fn.jquery.split(' ')[0].split('.')",
       "  if ((version[0] < 2 && version[1] < 9) || (version[0] == 1 && version[1] == 9 && version[2] < 1)) {",
       "    throw new Error('Bootstrap\\'s JavaScript requires jQuery version 1.9.1 or higher')",