diff --git a/tests/config.php b/tests/config.php
index 37a94d8..3d55e1d 100644
--- a/tests/config.php
+++ b/tests/config.php
@@ -227,7 +227,7 @@
             'use_cache' => true,
             'workbox' => [
                 'warm_cache_urls' => ['privacy_policy', 'terms_of_service'],
-                'offline_fallback' => '/offline.html',
+                'page_fallback' => '/offline.html',
             ],
         ],
     ]);