diff --git a/telethon/types/_custom/message.py b/telethon/types/_custom/message.py
index 24eed18f..c108b6ae 100644
--- a/telethon/types/_custom/message.py
+++ b/telethon/types/_custom/message.py
@@ -22,7 +22,7 @@ def _fwd(field, doc):
         return getattr(self._message, field, None)
 
     def fset(self, value):
-        setattr(self._message, field, value)
+        object.__setattr__(self._message, field, value)
 
     return property(fget, fset, None, doc)