diff --git a/core/modules/system/src/SystemManager.php b/core/modules/system/src/SystemManager.php
index 010745342e7..11c3efcde83 100644
--- a/core/modules/system/src/SystemManager.php
+++ b/core/modules/system/src/SystemManager.php
@@ -28,13 +28,6 @@ class SystemManager {
    */
   protected $moduleHandler;
 
-  /**
-   * Database Service Object.
-   *
-   * @var \Drupal\Core\Database\Connection
-   */
-  protected $database;
-
   /**
    * The request stack.
    *
@@ -83,8 +76,6 @@ class SystemManager {
    *
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    *   The module handler.
-   * @param \Drupal\Core\Database\Connection $database
-   *   The database connection.
    * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
    *   The entity manager.
    * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
@@ -94,9 +85,8 @@ class SystemManager {
    * @param \Drupal\Core\Menu\MenuActiveTrailInterface $menu_active_trail
    *   The active menu trail service.
    */
-  public function __construct(ModuleHandlerInterface $module_handler, Connection $database, EntityManagerInterface $entity_manager, RequestStack $request_stack, MenuLinkTreeInterface $menu_tree, MenuActiveTrailInterface $menu_active_trail) {
+  public function __construct(ModuleHandlerInterface $module_handler, EntityManagerInterface $entity_manager, RequestStack $request_stack, MenuLinkTreeInterface $menu_tree, MenuActiveTrailInterface $menu_active_trail) {
     $this->moduleHandler = $module_handler;
-    $this->database = $database;
     $this->requestStack = $request_stack;
     $this->menuTree = $menu_tree;
     $this->menuActiveTrail = $menu_active_trail;
diff --git a/core/modules/system/system.services.yml b/core/modules/system/system.services.yml
index 453eea4f939..e95c91d440c 100644
--- a/core/modules/system/system.services.yml
+++ b/core/modules/system/system.services.yml
@@ -9,9 +9,7 @@ services:
       - { name: access_check, applies_to: _access_system_update }
   system.manager:
     class: Drupal\system\SystemManager
-    arguments: ['@module_handler', '@database', '@entity.manager', '@request_stack', '@menu.link_tree', '@menu.active_trail']
-    tags:
-      - { name: backend_overridable }
+    arguments: ['@module_handler', '@entity.manager', '@request_stack', '@menu.link_tree', '@menu.active_trail']
   system.breadcrumb.default:
     class: Drupal\system\PathBasedBreadcrumbBuilder
     arguments: ['@router.request_context', '@access_manager', '@router', '@path_processor_manager', '@config.factory',  '@title_resolver', '@current_user']