diff --git a/pandora_console/views/calendar/special_days_edit.php b/pandora_console/views/calendar/special_days_edit.php
index 5bfaa540b4..7ea8c17462 100644
--- a/pandora_console/views/calendar/special_days_edit.php
+++ b/pandora_console/views/calendar/special_days_edit.php
@@ -108,6 +108,7 @@ $inputs[] = [
         'returnAllGroup' => $display_all_group,
         'name'           => 'id_group',
         'selected'       => $specialDay->id_group(),
+        'required'       => true,
     ],
 ];