diff --git a/includes/form.inc b/includes/form.inc
index 31e200b80c1d858dbdd80d15653496c6d964bea7..53d958b574b80dd589f000e4d4e882ee6e2fb4ff 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -239,6 +239,7 @@ function drupal_build_form($form_id, &$form_state) {
  */
 function form_state_defaults() {
   return array(
+    'args' => array(),
     'rebuild' => FALSE,
     'redirect' => NULL,
     'storage' => NULL,