diff --git a/core/modules/book/book.module b/core/modules/book/book.module
index 0187bda..f02dc95 100644
--- a/core/modules/book/book.module
+++ b/core/modules/book/book.module
@@ -480,7 +480,7 @@ function book_pick_book_nojs_submit($form, &$form_state) {
  *   A parent selection form element.
  */
 function _book_parent_select($book_link) {
-  if (variable_get('menu_override_parent_selector', FALSE)) {
+  if (config('menu.settings')->get('override_parent_selector')) {
     return array();
   }
   // Offer a message or a drop-down to choose a different parent page.
diff --git a/core/modules/menu/config/menu.settings.yml b/core/modules/menu/config/menu.settings.yml
index 166d7eb..34f6998 100644
--- a/core/modules/menu/config/menu.settings.yml
+++ b/core/modules/menu/config/menu.settings.yml
@@ -1,2 +1,3 @@
 main_links: main
 secondary_links: account
+override_parent_selector: FALSE
diff --git a/core/modules/menu/menu.install b/core/modules/menu/menu.install
index 20277a7..ec5b6d4 100644
--- a/core/modules/menu/menu.install
+++ b/core/modules/menu/menu.install
@@ -101,3 +101,14 @@ function menu_update_8001() {
   }
 }
 
+/**
+ * Moves menu_override_parent_selector from variables to config.
+ *
+ * @ingroup config_upgrade
+ */
+function menu_update_8002() {
+  update_variables_to_config('menu.settings', array(
+    'menu_override_parent_selector' => 'override_parent_selector',
+  ));
+}
+
diff --git a/core/modules/menu/menu.module b/core/modules/menu/menu.module
index 73e4380..ffa972d 100644
--- a/core/modules/menu/menu.module
+++ b/core/modules/menu/menu.module
@@ -354,14 +354,14 @@ function menu_delete($menu) {
  *   and mlid. The list excludes the given item and its children.
  *
  * @todo This has to be turned into a #process form element callback. The
- *   'menu_override_parent_selector' variable is entirely superfluous.
+ *   'override_parent_selector' variable is entirely superfluous.
  */
 function menu_parent_options($menus, $item, $type = '') {
   // The menu_links table can be practically any size and we need a way to
   // allow contrib modules to provide more scalable pattern choosers.
   // hook_form_alter is too late in itself because all the possible parents are
-  // retrieved here, unless menu_override_parent_selector is set to TRUE.
-  if (variable_get('menu_override_parent_selector', FALSE)) {
+  // retrieved here, unless override_parent_selector is set to TRUE.
+  if (config('menu.settings')->get('override_parent_selector')) {
     return array();
   }