diff --git a/torba/client/basedatabase.py b/torba/client/basedatabase.py
index 3ed0fcae9..ac4c252b2 100644
--- a/torba/client/basedatabase.py
+++ b/torba/client/basedatabase.py
@@ -72,8 +72,9 @@ class AIOSQLite:
             self.executor.submit(self.__run_transaction_with_foreign_keys_disabled, fun, *args, **kwargs)
         )
 
-    def __run_transaction_with_foreign_keys_disabled(self, fun: Callable[[sqlite3.Connection, Any, Any], Any], *args,
-                                                     **kwargs):
+    def __run_transaction_with_foreign_keys_disabled(self,
+                                                     fun: Callable[[sqlite3.Connection, Any, Any], Any],
+                                                     *args, **kwargs):
         foreign_keys_enabled, = self.connection.execute("pragma foreign_keys").fetchone()
         if not foreign_keys_enabled:
             raise sqlite3.IntegrityError("foreign keys are disabled, use `AIOSQLite.run` instead")