1 files changed, 1 insertions, 0 deletions
diff --git a/tests/logging/test_terse_json.py b/tests/logging/test_terse_json.py
index 96f399b7ab..0b0d8737c1 100644
--- a/tests/logging/test_terse_json.py
+++ b/tests/logging/test_terse_json.py
@@ -153,6 +153,7 @@ class TerseJsonTestCase(LoggerCleanupMixin, TestCase):
         site.site_tag = "test-site"
         site.server_version_string = "Server v1"
         site.reactor = Mock()
+        site.experimental_cors_msc3886 = False
         request = SynapseRequest(FakeChannel(site, None), site)
         # Call requestReceived to finish instantiating the object.
         request.content = BytesIO()