diff --git a/core/misc/vertical-tabs.js b/core/misc/vertical-tabs.js
index a381bdc..386aae4 100644
--- a/core/misc/vertical-tabs.js
+++ b/core/misc/vertical-tabs.js
@@ -232,7 +232,7 @@
    */
   Drupal.theme.verticalTab = function (settings) {
     var tab = {};
-    tab.item = $('<li class="vertical-tabs__menu-item" tabindex="-1"></li>')
+    tab.item = $('<li class="vertical-tabs__menu-item" data-verticaltabid="' + settings['details']['context']['id'] + '" tabindex="-1"></li>')
       .append(tab.link = $('<a href="#"></a>')
         .append(tab.title = $('<strong class="vertical-tabs__menu-item-title"></strong>').text(settings.title))
         .append(tab.summary = $('<span class="vertical-tabs__menu-item-summary"></span>')