diff --git a/core/modules/book/lib/Drupal/book/Form/BookRemoveForm.php b/core/modules/book/lib/Drupal/book/Form/BookRemoveForm.php
index 8c1fee4..c6da0ae 100644
--- a/core/modules/book/lib/Drupal/book/Form/BookRemoveForm.php
+++ b/core/modules/book/lib/Drupal/book/Form/BookRemoveForm.php
@@ -4,10 +4,13 @@
 use Drupal\Core\ControllerInterface;
 use Drupal\Core\Form\FormInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Database\Connection;
 use Drupal\node\Plugin\Core\Entity\Node;
 
 class BookRemoveForm implements ControllerInterface, FormInterface {
 
+  protected $database;
+
   /**
    * Injects database service.
    *
@@ -15,13 +18,18 @@ class BookRemoveForm implements ControllerInterface, FormInterface {
    *   Symfony Container Interface.
    */
   public static function create(ContainerInterface $container) {
-    return new static();
+    return new static($container->get('database'));
   }
 
   /**
    * Constructs a BookRemoveForm object.
+   *
+   * @param \Drupal\Core\Database\Connection $database
+   *   Database connection.
    */
-  public function __construct() {}
+  public function __construct(Connection $database) {
+    $this->database = $database;
+  }
 
   /**
    * Implements \Drupal\Core\Form\FormInterface::getFormID().
@@ -70,7 +78,7 @@ public function submitForm(array &$form, array &$form_state) {
     $node = $form['#node'];
     if (_book_node_is_removable($node)) {
       menu_link_delete($node->book['mlid']);
-      db_delete('book')
+      $this->database->delete('book')
         ->condition('nid', $node->nid)
         ->execute();
       drupal_set_message(t('The post has been removed from the book.'));