diff --git a/core/tests/Drupal/Tests/Core/Routing/RedirectDestinationTest.php b/core/tests/Drupal/Tests/Core/Routing/RedirectDestinationTest.php
index fd99e99..2d733c3 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RedirectDestinationTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RedirectDestinationTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\Core\Routing;
 
+use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Routing\RedirectDestination;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\HttpFoundation\Request;
@@ -51,7 +52,7 @@ protected function setupUrlGenerator() {
       ->willReturnCallback(function($route, $parameters, $options) {
         $query_string = '';
         if (!empty($options['query'])) {
-          $query_string = '?' . $options['query'];
+          $query_string = '?' . UrlHelper::buildQuery($options['query']);
         }
 
         return '/current-path' . $query_string;