diff --git a/google/auth/transport/_aiohttp_requests.py b/google/auth/transport/_aiohttp_requests.py
index 2769ff99a..bc4d9dc69 100644
--- a/google/auth/transport/_aiohttp_requests.py
+++ b/google/auth/transport/_aiohttp_requests.py
@@ -308,7 +308,7 @@ async def request(
 
         async with aiohttp.ClientSession(
             auto_decompress=self._auto_decompress,
-            trust_env=kwargs.get('trust_env', False)
+            trust_env=kwargs.get("trust_env", False),
         ) as self._auth_request_session:
             auth_request = Request(self._auth_request_session)
             self._auth_request = auth_request