diff --git a/views_hst_filter.module b/views_hst_filter.module
index 87a4804..7c9016b 100644
--- a/views_hst_filter.module
+++ b/views_hst_filter.module
@@ -67,7 +67,7 @@ function views_hst_filter_form_views_exposed_form_alter(&$form, &$form_state) {
       Drupal.behaviors.views_hst_filter = {
         attach: function(context, settings) {
           for (ajax_object in Drupal.ajax) {
-            if (Drupal.ajax[ajax_object].options) {
+            if (Drupal.ajax[ajax_object].callback == "views_hst_filter_ajax_callback") {
               jQuery.extend(Drupal.ajax[ajax_object].options.data, Drupal.settings.exposed_form_info);
             }
           }