diff --git a/src/flask/helpers.py b/src/flask/helpers.py
index b4ca16bf..ba1f1089 100644
--- a/src/flask/helpers.py
+++ b/src/flask/helpers.py
@@ -49,7 +49,7 @@ def get_load_dotenv(default: bool = True) -> bool:
 
 
 def stream_with_context(
-    generator_or_function: t.Iterator[t.AnyStr] | t.Callable[..., t.Iterator[t.AnyStr]]
+    generator_or_function: t.Iterator[t.AnyStr] | t.Callable[..., t.Iterator[t.AnyStr]],
 ) -> t.Iterator[t.AnyStr]:
     """Request contexts disappear when the response is started on the server.
     This is done for efficiency reasons and to make it less likely to encounter