2 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/engines/postgres.py b/synapse/storage/engines/postgres.py
index a323028546..4a855ffd56 100644
--- a/synapse/storage/engines/postgres.py
+++ b/synapse/storage/engines/postgres.py
@@ -19,6 +19,8 @@ from ._base import IncorrectDatabaseSetup
 
 
 class PostgresEngine(object):
+    single_threaded = False
+
     def __init__(self, database_module):
         self.module = database_module
         self.module.extensions.register_type(self.module.extensions.UNICODE)
diff --git a/synapse/storage/engines/sqlite3.py b/synapse/storage/engines/sqlite3.py
index ff13d8006a..d18e2808d1 100644
--- a/synapse/storage/engines/sqlite3.py
+++ b/synapse/storage/engines/sqlite3.py
@@ -17,6 +17,8 @@ from synapse.storage import prepare_database, prepare_sqlite3_database
 
 
 class Sqlite3Engine(object):
+    single_threaded = True
+
     def __init__(self, database_module):
         self.module = database_module