diff --git a/core/modules/system/src/Tests/Routing/DestinationTest.php b/core/modules/system/src/Tests/Routing/DestinationTest.php
index 3d45aab..a590d62 100644
--- a/core/modules/system/src/Tests/Routing/DestinationTest.php
+++ b/core/modules/system/src/Tests/Routing/DestinationTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\system\Tests\Routing;
 
+use Drupal\Core\Url;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -76,7 +77,7 @@ public function testDestination() {
     \Drupal::configFactory()->getEditable('system.site')->set('page.404', 'system-test/get-destination')->save();
     $this->drupalGet('http://example.com', ['external' => FALSE]);
     $this->assertResponse(404);
-    $this->assertIdentical('/', $this->getRawContent(), 'External URL is not allowed on 404 pages.');
+    $this->assertIdentical(Url::fromRoute('<front>')->toString(), $this->getRawContent(), 'External URL is not allowed on 404 pages.');
   }
 
 }