diff --git a/core/modules/rest/src/Tests/RESTTestBase.php b/core/modules/rest/src/Tests/RESTTestBase.php
index f247b16..b939bae 100644
--- a/core/modules/rest/src/Tests/RESTTestBase.php
+++ b/core/modules/rest/src/Tests/RESTTestBase.php
@@ -99,6 +99,7 @@ protected function cookies() {
       $cookies[$key][] = $cookie['value'];
     }
 
+    $request = \Drupal::request();
     $cookies = NestedArray::mergeDeep($cookies, $this->extractCookiesFromRequest($request));
 
     $cookie_jar = new FileCookieJar($this->cookieFile);