diff --git a/stdlib/2and3/pstats.pyi b/stdlib/2and3/pstats.pyi
index 9a872c2dd..2d70f8859 100644
--- a/stdlib/2and3/pstats.pyi
+++ b/stdlib/2and3/pstats.pyi
@@ -8,7 +8,7 @@ _T = TypeVar('_T', bound='Stats')
 class Stats:
     def __init__(self: _T, __arg: Union[None, str, Text, Profile, cProfile] = ...,
                  *args: Union[None, str, Text, Profile, cProfile, _T],
-                 stream: IO[Any]) -> None: ...
+                 stream: IO[Any] = ...) -> None: ...
     def init(self, arg: Union[None, str, Text, Profile, cProfile]) -> None: ...
     def load_stats(self, arg: Union[None, str, Text, Profile, cProfile]) -> None: ...
     def get_top_level_stats(self) -> None: ...