diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index d0e3ef6b0cb5..4378fdf39192 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -725,7 +725,7 @@ def min(iterable: Iterable[_T], key: Callable[[_T], Any] = ...) -> _T: ...
 @overload
 def next(i: Iterator[_T]) -> _T: ...
 @overload
-def next(i: Iterator[_T], default: _T) -> _T: ...
+def next(i: Iterator[_T], default: _VT) -> Union[_T, _VT]: ...
 def oct(i: int) -> str: ...  # TODO __index__
 @overload
 def open(file: str, mode: str = 'r', buffering: int = ...) -> BinaryIO: ...
diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 87828bf52bf4..895ec09513e7 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -743,7 +743,7 @@ def min(iterable: Iterable[_T], key: Callable[[_T], Any] = ..., default: _T = ..
 @overload
 def next(i: Iterator[_T]) -> _T: ...
 @overload
-def next(i: Iterator[_T], default: _T) -> _T: ...
+def next(i: Iterator[_T], default: _VT) -> Union[_T, _VT]: ...
 def oct(i: int) -> str: ...  # TODO __index__
 
 if sys.version_info >= (3, 6):