diff --git a/wp-admin/menu-header.php b/wp-admin/menu-header.php
index 8cdc6a8dc..5321a32b5 100644
--- a/wp-admin/menu-header.php
+++ b/wp-admin/menu-header.php
@@ -30,7 +30,7 @@ get_admin_page_parent();
  * @param array $submenu
  * @param bool $submenu_as_parent
  */
-function _wp_menu_output( &$menu, &$submenu, $submenu_as_parent = true ) {
+function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 	global $self, $parent_file, $submenu_file, $plugin_page, $pagenow;
 
 	$first = true;