diff --git a/stdlib/3/os/__init__.pyi b/stdlib/3/os/__init__.pyi
index 612ce7c4a..de5a34a63 100644
--- a/stdlib/3/os/__init__.pyi
+++ b/stdlib/3/os/__init__.pyi
@@ -210,10 +210,10 @@ if sys.version_info >= (3, 6):
         name: AnyStr
         path: AnyStr
         def inode(self) -> int: ...
-        def is_dir(self, follow_symlinks: bool = ...) -> bool: ...
-        def is_file(self, follow_symlinks: bool = ...) -> bool: ...
+        def is_dir(self, *, follow_symlinks: bool = ...) -> bool: ...
+        def is_file(self, *, follow_symlinks: bool = ...) -> bool: ...
         def is_symlink(self) -> bool: ...
-        def stat(self) -> stat_result: ...
+        def stat(self, *, follow_symlinks: bool = ...) -> stat_result: ...
 
         def __fspath__(self) -> AnyStr: ...
 elif sys.version_info >= (3, 5):
@@ -224,10 +224,10 @@ elif sys.version_info >= (3, 5):
         name: AnyStr
         path: AnyStr
         def inode(self) -> int: ...
-        def is_dir(self, follow_symlinks: bool = ...) -> bool: ...
-        def is_file(self, follow_symlinks: bool = ...) -> bool: ...
+        def is_dir(self, *, follow_symlinks: bool = ...) -> bool: ...
+        def is_file(self, *, follow_symlinks: bool = ...) -> bool: ...
         def is_symlink(self) -> bool: ...
-        def stat(self) -> stat_result: ...
+        def stat(self, *, follow_symlinks: bool = ...) -> stat_result: ...
 
 
 if sys.platform != 'win32':