diff --git a/tornado/platform/asyncio.py b/tornado/platform/asyncio.py
index <HASH>..<HASH> 100644
--- a/tornado/platform/asyncio.py
+++ b/tornado/platform/asyncio.py
@@ -277,7 +277,7 @@ class BaseAsyncIOLoop(IOLoop):
         self,
         executor: Optional[concurrent.futures.Executor],
         func: Callable[..., _T],
-        *args: Any
+        *args: Any,
     ) -> Awaitable[_T]:
         return self.asyncio_loop.run_in_executor(executor, func, *args)
trailing comma?

black seems to have changed its mind