diff --git a/views_hst_filter.js b/views_hst_filter.js
index 78631d5..0e2581b 100644
--- a/views_hst_filter.js
+++ b/views_hst_filter.js
@@ -2,7 +2,7 @@
   Drupal.behaviors.viewsHstFilter = {
     attach: function(context, settings) {
       for (ajaxObject in Drupal.ajax) {
-        if ('views_hst_filter_ajax_callback' == Drupal.ajax[ajaxObject].callback) {
+        if (Drupal.ajax[ajaxObject].callback == 'views_hst_filter_ajax_callback') {
           jQuery.extend(Drupal.ajax[ajaxObject].options.data, Drupal.settings.exposed_form_info);
         }
       }