diff --git a/stdlib/2and3/webbrowser.pyi b/stdlib/2and3/webbrowser.pyi
index 3d276c8c0..aacef598f 100644
--- a/stdlib/2and3/webbrowser.pyi
+++ b/stdlib/2and3/webbrowser.pyi
@@ -3,7 +3,10 @@ from typing import Any, Optional, Callable, List, Text, Union, Sequence
 
 class Error(Exception): ...
 
-def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: BaseBrowser = ..., update_tryorder: int = ...) -> None: ...
+if sys.version_info >= (3, 7):
+    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: BaseBrowser = ..., *, preferred: bool = ...) -> None: ...
+else:
+    def register(name: Text, klass: Optional[Callable[[], BaseBrowser]], instance: BaseBrowser = ..., update_tryorder: int = ...) -> None: ...
 def get(using: Optional[Text] = ...) -> BaseBrowser: ...
 def open(url: Text, new: int = ..., autoraise: bool = ...) -> bool: ...
 def open_new(url: Text) -> bool: ...