diff --git a/telegram/callbackquery.py b/telegram/callbackquery.py
index f9e02a10554..361e493b7b4 100644
--- a/telegram/callbackquery.py
+++ b/telegram/callbackquery.py
@@ -174,7 +174,7 @@ def edit_message_caption(
         return self.message.edit_caption(caption=caption, *args, **kwargs)
 
     def edit_message_reply_markup(
-        self, reply_markup: 'InlineKeyboardMarkup', *args: Any, **kwargs: Any
+        self, reply_markup: Optional['InlineKeyboardMarkup'], *args: Any, **kwargs: Any
     ) -> Union[Message, bool]:
         """Shortcut for either::