1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/config/workers.py b/synapse/config/workers.py
index 4507992031..576f519188 100644
--- a/synapse/config/workers.py
+++ b/synapse/config/workers.py
@@ -1,4 +1,5 @@
 # Copyright 2016 OpenMarket Ltd
+# Copyright 2021 The Matrix.org Foundation C.I.C.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import argparse
 from typing import List, Union
 
 import attr
@@ -343,7 +345,7 @@ class WorkerConfig(Config):
         #worker_replication_secret: ""
         """
 
-    def read_arguments(self, args):
+    def read_arguments(self, args: argparse.Namespace) -> None:
         # We support a bunch of command line arguments that override options in
         # the config. A lot of these options have a worker_* prefix when running
         # on workers so we also have to override them when command line options