diff --git a/modules/search/search.module b/modules/search/search.module
index cb6d0f7..622b8f5 100644
--- a/modules/search/search.module
+++ b/modules/search/search.module
@@ -1047,7 +1047,7 @@ function search_form(&$form_state, $action = '', $keys = '', $type = NULL, $prom
   );
   // processed_keys is used to coordinate keyword passing between other forms
   // that hook into the basic search form.
-  $form['basic']['inline']['processed_keys'] = array('#type' => 'value', '#value' => array());
+  $form['basic']['inline']['processed_keys'] = array('#type' => 'value', '#value' => '');
   $form['basic']['inline']['submit'] = array('#type' => 'submit', '#value' => t('Search'));
 
   return $form;