diff --git a/core/modules/book/book.services.yml b/core/modules/book/book.services.yml
index a2977f8..10b946b 100644
--- a/core/modules/book/book.services.yml
+++ b/core/modules/book/book.services.yml
@@ -6,7 +6,7 @@ services:
       - { name: breadcrumb_builder, priority: 701 }
   book.manager:
     class: Drupal\book\BookManager
-    arguments: ['@database', '@entity.manager', '@string_translation', '@config.factory', '@book.storage']
+    arguments: ['@entity.manager', '@string_translation', '@config.factory', '@book.storage']
   book.outline:
     class: Drupal\book\BookOutline
     arguments: ['@book.manager']
diff --git a/core/modules/book/src/BookManager.php b/core/modules/book/src/BookManager.php
index 41f752f..36614bc 100644
--- a/core/modules/book/src/BookManager.php
+++ b/core/modules/book/src/BookManager.php
@@ -30,13 +30,6 @@ class BookManager implements BookManagerInterface {
   const BOOK_MAX_DEPTH = 9;
 
   /**
-   * Database Service Object.
-   *
-   * @var \Drupal\Core\Database\Connection
-   */
-  protected $connection;
-
-  /**
    * Entity manager Service Object.
    *
    * @var \Drupal\Core\Entity\EntityManagerInterface
@@ -74,8 +67,7 @@ class BookManager implements BookManagerInterface {
   /**
    * Constructs a BookManager object.
    */
-  public function __construct(Connection $connection, EntityManagerInterface $entity_manager, TranslationInterface $translation, ConfigFactoryInterface $config_factory, BookStorageInterface $book_storage) {
-    $this->connection = $connection;
+  public function __construct(EntityManagerInterface $entity_manager, TranslationInterface $translation, ConfigFactoryInterface $config_factory, BookStorageInterface $book_storage) {
     $this->entityManager = $entity_manager;
     $this->stringTranslation = $translation;
     $this->configFactory = $config_factory;
diff --git a/core/modules/book/tests/src/BookManagerTest.php b/core/modules/book/tests/src/BookManagerTest.php
index a7e0964..93e7e63 100644
--- a/core/modules/book/tests/src/BookManagerTest.php
+++ b/core/modules/book/tests/src/BookManagerTest.php
@@ -17,13 +17,6 @@
 class BookManagerTest extends UnitTestCase {
 
   /**
-   * The mocked database connection.
-   *
-   * @var \Drupal\Core\Database\Connection|\PHPUnit_Framework_MockObject_MockObject
-   */
-  protected $connection;
-
-  /**
    * The mocked entity manager.
    *
    * @var \Drupal\Core\Entity\EntityManager|\PHPUnit_Framework_MockObject_MockObject
@@ -62,14 +55,11 @@ class BookManagerTest extends UnitTestCase {
    * {@inheritdoc}
    */
   protected function setUp() {
-    $this->connection = $this->getMockBuilder('Drupal\Core\Database\Connection')
-      ->disableOriginalConstructor()
-      ->getMock();
     $this->entityManager = $this->getMock('Drupal\Core\Entity\EntityManagerInterface');
     $this->translation = $this->getStringTranslationStub();
     $this->configFactory = $this->getConfigFactoryStub(array());
     $this->bookStorage = $this->getMock('Drupal\book\BookStorageInterface');
-    $this->bookManager = new BookManager($this->connection, $this->entityManager, $this->translation, $this->configFactory, $this->bookStorage);
+    $this->bookManager = new BookManager($this->entityManager, $this->translation, $this->configFactory, $this->bookStorage);
   }
 
   /**