diff --git a/date/date_popup/date_popup.module b/date/date_popup/date_popup.module
index 62fba29..ae47a41 100644
--- a/date/date_popup/date_popup.module
+++ b/date/date_popup/date_popup.module
@@ -99,6 +99,7 @@ function date_popup_js_settings_id($id, $func, $settings) {
     'func' => $func,
     'settings' => $settings
   );
+  drupal_alter('date_popup_settings', $js_settings);
   drupal_add_js($js_settings, 'setting');
   return $return_id;
 }