1 files changed, 4 insertions, 0 deletions
diff --git a/tests/server.py b/tests/server.py
index b404ad4e2a..f7f5276b21 100644
--- a/tests/server.py
+++ b/tests/server.py
@@ -372,6 +372,10 @@ def setup_test_homeserver(cleanup_func, *args, **kwargs):
         pool.threadpool = ThreadPool(clock._reactor)
         pool.running = True
 
+    # We've just changed the Databases to run DB transactions on the same
+    # thread, so we need to disable the dedicated thread behaviour.
+    server.get_datastores().main.USE_DEDICATED_DB_THREADS_FOR_EVENT_FETCHING = False
+
     return server