diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index 7c01b1a1..45b3d172 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -24997,7 +24997,7 @@ void MessagesManager::on_get_channel_dialog(DialogId dialog_id, MessageId last_m
         LOG(ERROR) << added_full_message_id << " doesn't became last new message";
         dump_debug_message_op(d, 2);
       }
-    } else {
+    } else if (last_message_id.get() > d->last_new_message_id.get()) {
       set_dialog_last_new_message_id(d, last_message_id,
                                      "on_get_channel_dialog 40");  // skip updates about some messages
     }