diff --git a/core/modules/book/lib/Drupal/book/BookManager.php b/core/modules/book/lib/Drupal/book/BookManager.php
index 1f9522b..a93cfe3 100644
--- a/core/modules/book/lib/Drupal/book/BookManager.php
+++ b/core/modules/book/lib/Drupal/book/BookManager.php
@@ -45,7 +45,7 @@ class BookManager {
    *
    * @var \Drupal\Core\Config\ConfigFactory
    */
-  protected $menuConfig;
+  protected $ConfigFactory;
 
   /**
    * Books Array.
@@ -61,7 +61,7 @@ public function __construct(Connection $connection, EntityManager $entity_manage
     $this->connection = $connection;
     $this->entityManager = $entity_manager;
     $this->translation =  $translation;
-    $this->menuConfig = $config_factory->get('menu.settings');
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -410,7 +410,7 @@ function updateID($book_link) {
    *   A parent selection form element.
    */
   function addParentSelectFormElements($book_link) {
-    if ($this->menuConfig->get('override_parent_selector')) {
+    if ($this->configFactory->get('menu.settings')->get('override_parent_selector')) {
       return array();
     }
     // Offer a message or a drop-down to choose a different parent page.