diff --git a/cctv-scheduler.py b/cctv-scheduler.py
index a719b2b..05683dd 100644
--- a/cctv-scheduler.py
+++ b/cctv-scheduler.py
@@ -2865,7 +2865,7 @@ class Telegram:
                     chat = chat.split('_')[0]
                 url = self.api_path + '/send' + media_type + '?chat_id=' + chat
                 if thrd:
-                    url = url + '?message_thread_id=' + thrd
+                    url = url + '&message_thread_id=' + thrd
             else:
                 raise ValueError("'media_type' value is wrong: " + media_type)