diff --git a/stdlib/3/os/__init__.pyi b/stdlib/3/os/__init__.pyi
index ecf894e14..b19359561 100644
--- a/stdlib/3/os/__init__.pyi
+++ b/stdlib/3/os/__init__.pyi
@@ -182,8 +182,24 @@ class statvfs_result:  # Unix only
     f_namemax = 0
 
 # ----- os function stubs -----
-def fsencode(filename: str) -> bytes: ...
-def fsdecode(filename: bytes) -> str: ...
+if sys.version_info >= (3, 6):
+    def fsencode(filename: Union[str, PathLike]) -> bytes: ...
+else:
+    def fsencode(filename: str) -> bytes: ...
+
+if sys.version_info >= (3, 6):
+    def fsdecode(filename: Union[bytes, PathLike]) -> str: ...
+else:
+    def fsdecode(filename: bytes) -> str: ...
+
+if sys.version_info >= (3, 6):
+    @overload
+    def fspath(path: str) -> str: ...
+    @overload
+    def fspath(path: bytes) -> bytes: ...
+    @overload
+    def fspath(path: PathLike) -> Union[str, bytes]: ...
+
 def get_exec_path(env: Optional[Mapping[str, str]] = ...) -> List[str]: ...
 # NOTE: get_exec_path(): returns List[bytes] when env not None
 def ctermid() -> str: ...  # Unix only