diff --git a/stdlib/2/__builtin__.pyi b/stdlib/2/__builtin__.pyi
index 78a413d6d..f9e61af2b 100644
--- a/stdlib/2/__builtin__.pyi
+++ b/stdlib/2/__builtin__.pyi
@@ -1430,10 +1430,16 @@ else:
                cmp: Callable[[_T, _T], int] = ...,
                key: Optional[Callable[[_T], Any]] = ...,
                reverse: bool = ...) -> List[_T]: ...
-@overload
-def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
-@overload
-def sum(__iterable: Iterable[_T], __start: _S) -> Union[_T, _S]: ...
+if sys.version_info >= (3, 8):
+    @overload
+    def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
+    @overload
+    def sum(__iterable: Iterable[_T], start: _S) -> Union[_T, _S]: ...
+else:
+    @overload
+    def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
+    @overload
+    def sum(__iterable: Iterable[_T], __start: _S) -> Union[_T, _S]: ...
 if sys.version_info < (3,):
     def unichr(__i: int) -> unicode: ...
 def vars(__object: Any = ...) -> Dict[str, Any]: ...
diff --git a/stdlib/2and3/builtins.pyi b/stdlib/2and3/builtins.pyi
index 78a413d6d..f9e61af2b 100644
--- a/stdlib/2and3/builtins.pyi
+++ b/stdlib/2and3/builtins.pyi
@@ -1430,10 +1430,16 @@ else:
                cmp: Callable[[_T, _T], int] = ...,
                key: Optional[Callable[[_T], Any]] = ...,
                reverse: bool = ...) -> List[_T]: ...
-@overload
-def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
-@overload
-def sum(__iterable: Iterable[_T], __start: _S) -> Union[_T, _S]: ...
+if sys.version_info >= (3, 8):
+    @overload
+    def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
+    @overload
+    def sum(__iterable: Iterable[_T], start: _S) -> Union[_T, _S]: ...
+else:
+    @overload
+    def sum(__iterable: Iterable[_T]) -> Union[_T, int]: ...
+    @overload
+    def sum(__iterable: Iterable[_T], __start: _S) -> Union[_T, _S]: ...
 if sys.version_info < (3,):
     def unichr(__i: int) -> unicode: ...
 def vars(__object: Any = ...) -> Dict[str, Any]: ...