diff -u b/media_multiselect.js b/media_multiselect.js
--- b/media_multiselect.js
+++ b/media_multiselect.js
@@ -39,6 +39,9 @@
                 Drupal.ajax[attachButton.attr('id')].beforeSerialize = function(element, options) {
                   options.data['ajax_page_state[theme]'] = Drupal.settings.ajaxPageState.theme;
                   options.data['ajax_page_state[theme_token]'] = Drupal.settings.ajaxPageState.theme_token;
+                  if (Drupal.settings.ajaxPageState.jquery_version) {
+                    options.data['ajax_page_state[jquery_version]'] = Drupal.settings.ajaxPageState.jquery_version;
+                  }
                 };
 
                 // Trigger the attach button.