diff --git a/widgets.admin.inc b/widgets.admin.inc
index 13999ce..1b489b7 100644
--- a/widgets.admin.inc
+++ b/widgets.admin.inc
@@ -489,7 +489,7 @@ function widgets_set_name_validate($element, $form_state) {
  * @ingroup forms
  * @see widgets_set_delete_form_submit()
  */
-function widgets_set_delete_form($form, $form_state, $set) {
+function widgets_set_delete_form($form, &$form_state, $set) {
   $form_state['widgets_set'] = $set;
 
   $replacement_sets = array_diff_key(widgets_set_options(), array($set['name'] => ''));