diff --git a/modules/locale/locale.datepicker.js b/modules/locale/locale.datepicker.js
index f819282..f072cf3 100644
--- a/modules/locale/locale.datepicker.js
+++ b/modules/locale/locale.datepicker.js
@@ -5,6 +5,9 @@
  */
 Drupal.behaviors.localeDatepicker = {
   attach: function(context, settings) {
+    if (!Drupal.settings.jquery || !Drupal.settings.jquery.ui || !Drupal.settings.jquery.ui.datepicker) {
+      return;
+    }
     // This code accesses Drupal.settings and localized strings via Drupal.t().
     // So this code should run after these are initialized. By placing it in an
     // attach behavior this is assured.