diff --git a/clientside_validation.js b/clientside_validation.js
index f8de3f2..62789ee 100644
--- a/clientside_validation.js
+++ b/clientside_validation.js
@@ -597,7 +597,7 @@
         }
         if(self.forms[f].general.validateTabs) {
           if($('.vertical-tabs-pane input').length) {
-            validate_options.ignore += ' :not(.vertical-tabs-pane :input, .horizontal-tabs-pane :input)';
+            validate_options.ignore += (validate_options.ignore == '') ? '.horizontal-tab-hidden :input' : ', .horizontal-tab-hidden :input';
           }
         }
         else {