diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 850b894..3991636 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -8,7 +8,6 @@
 use Drupal\file\Plugin\Core\Entity\File;
 use Drupal\user\Plugin\Core\Entity\User;
 use Drupal\user\UserRole;
-use Drupal\user\Controller\UserController;
 use Drupal\Core\Template\Attribute;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Drupal\menu_link\Plugin\Core\Entity\MenuLink;
@@ -1055,7 +1054,8 @@ function user_menu_site_status_alter(&$menu_site_status, $path) {
   if ($menu_site_status == MENU_SITE_OFFLINE) {
     // If the site is offline, log out unprivileged users.
     if (user_is_logged_in() && !user_access('access site in maintenance mode')) {
-      UserController::create(Drupal::getContainer())->logout()->send();
+      module_load_include('pages.inc', 'user', 'user');
+      user_logout();
     }
 
     if (user_is_anonymous()) {
diff --git a/core/modules/user/user.pages.inc b/core/modules/user/user.pages.inc
index debb55a..13e613b 100644
--- a/core/modules/user/user.pages.inc
+++ b/core/modules/user/user.pages.inc
@@ -163,6 +163,22 @@ function user_pass_reset($form, &$form_state, $uid, $timestamp, $hashed_pass, $a
 }
 
 /**
+ * Logs the current user out, and redirects to the home page.
+ */
+function user_logout() {
+  global $user;
+
+  watchdog('user', 'Session closed for %name.', array('%name' => $user->name));
+
+  module_invoke_all('user_logout', $user);
+
+  // Destroy the current session, and reset $user to the anonymous user.
+  session_destroy();
+
+  drupal_goto();
+}
+
+/**
  * Process variables for user.tpl.php.
  *
  * The $variables array contains the following arguments: