1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/http/proxyagent.py b/synapse/http/proxyagent.py
index a16dde2380..b2a50c9105 100644
--- a/synapse/http/proxyagent.py
+++ b/synapse/http/proxyagent.py
@@ -245,7 +245,7 @@ def http_proxy_endpoint(
     proxy: Optional[bytes],
     reactor: IReactorCore,
     tls_options_factory: Optional[IPolicyForHTTPS],
-    **kwargs,
+    **kwargs: object,
 ) -> Tuple[Optional[IStreamClientEndpoint], Optional[ProxyCredentials]]:
     """Parses an http proxy setting and returns an endpoint for the proxy