diff --git a/pyrogram/dispatcher.py b/pyrogram/dispatcher.py
index fd860070..a145e531 100644
--- a/pyrogram/dispatcher.py
+++ b/pyrogram/dispatcher.py
@@ -68,7 +68,7 @@ class Dispatcher:
         async def message_parser(update, users, chats):
             return (
                 await pyrogram.types.Message._parse(self.client, update.message, users, chats,
-                                                    isinstance(update, UpdateNewScheduledMessage)),
+                                                    is_scheduled=isinstance(update, UpdateNewScheduledMessage)),
                 MessageHandler
             )