diff --git a/test_config.yml b/test_config.yml
index 41aeff7..fea4e85 100644
--- a/test_config.yml
+++ b/test_config.yml
@@ -481,6 +481,7 @@ services:
       SMTP_PASSWORD: ''
       SMTP_PORT: '587'
       SMTP_SERVER: smtp.mailgun.org
+      STREAMING_API_BASE_URL: wss://mastodon-streaming.example.com
       VAPID_PRIVATE_KEY: ''
       VAPID_PUBLIC_KEY: ''
     image: tootsuite/mastodon