diff --git a/maubot/client.py b/maubot/client.py
index 83e5478..bf0fe42 100644
--- a/maubot/client.py
+++ b/maubot/client.py
@@ -188,7 +188,7 @@ class Client(DBClient):
         self.crypto_store = PgCryptoStore(
             account_id=self.id,
             pickle_key=self.maubot.crypto_db_pickle_key,
-            db=self.maubot.crypto_db
+            db=self.maubot.crypto_db,
         )
         self.crypto = OlmMachine(
             self.client,