diff --git a/src/main/content/_assets/js/tabs.js b/src/main/content/_assets/js/tabs.js
index 9e142f8523..9967393a90 100644
--- a/src/main/content/_assets/js/tabs.js
+++ b/src/main/content/_assets/js/tabs.js
@@ -66,7 +66,7 @@ $(document).ready(function() {
         // get class of clicked tab and class of its respective content section
         var class_list = this.classList;
         for (var i = 0; i < class_list.length; i++) {
-            class_name = class_list[i];
+            var class_name = class_list[i];
             if (class_name !== "tab_link" && class_name.indexOf("_link") > -1) {
                 var tab_content = "." + class_name.replace("link", "section");
                 var tab_class = "." + class_name;