diff --git a/src/sfapi_client/_async/client.py b/src/sfapi_client/_async/client.py
index f166424..63aaead 100644
--- a/src/sfapi_client/_async/client.py
+++ b/src/sfapi_client/_async/client.py
@@ -278,7 +278,7 @@ async def _http_client(self):
                     token_endpoint=self._token_url,
                     timeout=10.0,
                     headers=headers,
-                    mounts=proxy_mounts
+                    mounts=proxy_mounts,
                 )
 
                 await self.__http_client.fetch_token()
diff --git a/src/sfapi_client/_sync/client.py b/src/sfapi_client/_sync/client.py
index 52d2436..2f35ac0 100644
--- a/src/sfapi_client/_sync/client.py
+++ b/src/sfapi_client/_sync/client.py
@@ -278,7 +278,7 @@ def _http_client(self):
                     token_endpoint=self._token_url,
                     timeout=10.0,
                     headers=headers,
-                    mounts=proxy_mounts
+                    mounts=proxy_mounts,
                 )
 
                 self.__http_client.fetch_token()