diff --git a/telethon/tl/custom/button.py b/telethon/tl/custom/button.py
index 27ea10eb..99926d02 100644
--- a/telethon/tl/custom/button.py
+++ b/telethon/tl/custom/button.py
@@ -48,7 +48,8 @@ class Button:
         return isinstance(button, (
             types.KeyboardButtonCallback,
             types.KeyboardButtonSwitchInline,
-            types.KeyboardButtonUrl
+            types.KeyboardButtonUrl,
+            types.InputKeyboardButtonUrlAuth
         ))
 
     @staticmethod