1 files changed, 3 insertions, 1 deletions
diff --git a/scripts-dev/mypy_synapse_plugin.py b/scripts-dev/mypy_synapse_plugin.py
index f7f18805e4..18df68305b 100644
--- a/scripts-dev/mypy_synapse_plugin.py
+++ b/scripts-dev/mypy_synapse_plugin.py
@@ -87,7 +87,9 @@ def cached_function_method_signature(ctx: MethodSigContext) -> CallableType:
     arg_kinds.append(ARG_NAMED_OPT)  # Arg is an optional kwarg.
 
     signature = signature.copy_modified(
-        arg_types=arg_types, arg_names=arg_names, arg_kinds=arg_kinds,
+        arg_types=arg_types,
+        arg_names=arg_names,
+        arg_kinds=arg_kinds,
     )
 
     return signature