diff --git a/js/misc/_vertical-tabs.js b/js/misc/_vertical-tabs.js
index e8588e0..6ec9e70 100644
--- a/js/misc/_vertical-tabs.js
+++ b/js/misc/_vertical-tabs.js
@@ -109,11 +109,12 @@ Drupal.verticalTab.prototype = {
       .siblings('fieldset.vertical-tabs-pane')
         .each(function () {
           $(this).addClass('fade');
+          $(this).removeClass('in active');
           var tab = $(this).data('verticalTab');
           tab.item.removeClass('selected');
         })
         .end()
-        .addClass('fade in')
+        .addClass('fade in active')
         .siblings(':hidden.vertical-tabs-active-tab')
         .val(this.fieldset.attr('id'));
     this.fieldset.data('verticalTab').item.find('a').tab('show');