diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index 93df3dbf13..bd10e003a9 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -300,7 +300,6 @@ protected function initMink() {
       // peer verification so that testing under HTTPS always works.
       /** @var \GuzzleHttp\Client $client */
       $client = $this->container->get('http_client_factory')->fromOptions([
-        'timeout' => NULL,
         'verify' => FALSE,
       ]);