diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index 2bef4fa092..d9618b70bd 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -314,7 +314,7 @@ protected function initMink() {
       $client = $this->container->get('http_client_factory')->fromOptions([
         'timeout' => NULL,
         'verify' => FALSE,
-        'cookies' => $cookies ?: FALSE,
+        'cookies' => isset($cookies) ? $cookies : FALSE,
       ]);
 
       // Inject a Guzzle middleware to generate debug output for every request