1 files changed, 1 insertions, 0 deletions
diff --git a/tests/utils.py b/tests/utils.py
index 25c33492a5..39895c739f 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -41,6 +41,7 @@ def setup_test_homeserver(name="test", datastore=None, config=None, **kargs):
     if config is None:
         config = Mock()
         config.signing_key = [MockKey()]
+        config.event_cache_size = 1
 
     if datastore is None:
         db_pool = SQLiteMemoryDbPool()