diff --git a/core/modules/ban/lib/Drupal/ban/EventSubscriber/BanSubscriber.php b/core/modules/ban/lib/Drupal/ban/EventSubscriber/BanSubscriber.php
index 6807cce828edf7aef80e6835ac54106dae180e24..47035ee9d8aa301ac19a9e880da5fba62fd196e3 100644
--- a/core/modules/ban/lib/Drupal/ban/EventSubscriber/BanSubscriber.php
+++ b/core/modules/ban/lib/Drupal/ban/EventSubscriber/BanSubscriber.php
@@ -13,6 +13,7 @@
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 use Drupal\ban\BanIpManager;
+use Drupal\Component\Utility\String;
 
 /**
  * Ban subscriber for controller requests.
@@ -45,7 +46,7 @@ public function __construct(BanIpManager $manager) {
   public function onKernelRequestBannedIpCheck(GetResponseEvent $event) {
     $ip = $event->getRequest()->getClientIp();
     if ($this->manager->isDenied($ip)) {
-      $response = new Response('Sorry, ' . check_plain($ip) . ' has been banned.', 403);
+      $response = new Response('Sorry, ' . String::checkPlain($ip) . ' has been banned.', 403);
       $event->setResponse($response);
     }
   }