diff --git a/tests/utils.py b/tests/utils.py
index 6adbdbfca1..e488238bb3 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -65,6 +65,7 @@ def setup_test_homeserver(name="test", datastore=None, config=None, reactor=None
         config.federation_domain_whitelist = None
         config.federation_rc_reject_limit = 10
         config.federation_rc_sleep_limit = 10
+        config.federation_rc_sleep_delay = 100
         config.federation_rc_concurrent = 10
         config.filter_timeline_limit = 5000
         config.user_directory_search_all_users = False