diff --git a/stdlib/3/os/__init__.pyi b/stdlib/3/os/__init__.pyi
index 1aa3390c2..bafa8242d 100644
--- a/stdlib/3/os/__init__.pyi
+++ b/stdlib/3/os/__init__.pyi
@@ -342,11 +342,16 @@ def renames(old: _PathType, new: _PathType) -> None: ...
 if sys.version_info >= (3, 3):
     def replace(src: _PathType, dst: _PathType) -> None: ...
 def rmdir(path: _PathType) -> None: ...
-if sys.version_info >= (3, 5):
+if sys.version_info >= (3, 6):
     @overload
-    def scandir(path: str = ...) -> Iterator[DirEntry[str]]: ...
+    def scandir() -> Iterator[DirEntry[str]]: ...
     @overload
-    def scandir(path: bytes) -> Iterator[DirEntry[bytes]]: ...
+    def scandir(path: Union[AnyStr, PathLike[AnyStr]]) -> Iterator[DirEntry[AnyStr]]: ...
+elif sys.version_info >= (3, 5):
+    @overload
+    def scandir() -> Iterator[DirEntry[str]]: ...
+    @overload
+    def scandir(path: AnyStr) -> Iterator[DirEntry[AnyStr]]: ...
 def stat(path: _PathType) -> stat_result: ...
 def stat_float_times(newvalue: Union[bool, None] = ...) -> bool: ...
 def statvfs(path: _PathType) -> statvfs_result: ...  # Unix only