diff --git a/core/modules/system/tests/src/Unit/EventSubscriber/AdminRouteSubscriberTest.php b/core/modules/system/tests/src/Unit/EventSubscriber/AdminRouteSubscriberTest.php
index b938dd4684..0f5bca50c0 100644
--- a/core/modules/system/tests/src/Unit/EventSubscriber/AdminRouteSubscriberTest.php
+++ b/core/modules/system/tests/src/Unit/EventSubscriber/AdminRouteSubscriberTest.php
@@ -61,7 +61,8 @@ public function providerTestAlterRoutes() {
     ];
 
     $expected_collection = new RouteCollection();
-    $expected_collection->add('route.name', (clone $admin_route)->setOption('_admin_route', TRUE));
+    $cloned_admin_route = clone $admin_route;
+    $expected_collection->add('route.name', $cloned_admin_route->setOption('_admin_route', TRUE));
     $collection = new RouteCollection();
     $collection->add('route.name', clone $admin_route);
     $data['admin route'] = [
@@ -70,7 +71,8 @@ public function providerTestAlterRoutes() {
     ];
 
     $expected_collection = new RouteCollection();
-    $expected_collection->add('route.name', (clone $admin_route_html)->setOption('_admin_route', TRUE));
+    $cloned_admin_route_html = clone $admin_route_html;
+    $expected_collection->add('route.name', $cloned_admin_route_html->setOption('_admin_route', TRUE));
     $collection = new RouteCollection();
     $collection->add('route.name', clone $admin_route_html);
     $data['admin route with explicit html'] = [