diff --git a/core/modules/menu/menu.module b/core/modules/menu/menu.module
index ece0300..b3d12d6 100644
--- a/core/modules/menu/menu.module
+++ b/core/modules/menu/menu.module
@@ -213,7 +213,8 @@ function menu_menu_predelete(Menu $menu) {
   $active_menus = $config->get('active_menus_default') ?: array_keys(menu_get_menus());
   if (in_array($menu->id(), $active_menus)) {
     $active_menus = array_diff($active_menus, array($menu->id()));
-    // Prevent the gap left by the removed menu from causing array indices to be saved
+    // Prevent the gap left by the removed menu from causing array indices to
+    // be saved.
     $active_menus = array_values($active_menus);
     $config
       ->set('active_menus_default', $active_menus)

diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 1bfc0b2..42ced4c 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1764,7 +1764,7 @@ function system_update_8032() {
  */
 function system_update_8033() {
   update_variables_to_config('system.menu', array(
-    'active_menus_default' => 'active_menus_default'
+    'menu_default_active_menus' => 'active_menus_default'
   ));
 }