diff --git a/telethon/utils.py b/telethon/utils.py
index 00976a8d..cb09f613 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -396,16 +396,13 @@ def get_input_message(message):
 
 
 def get_message_id(message):
-    """Sanitizes the 'reply_to' parameter a user may send"""
+    """Similar to :meth:`get_input_peer`, but for message IDs."""
     if message is None:
         return None
 
     if isinstance(message, int):
         return message
 
-    if hasattr(message, 'original_message'):
-        return message.original_message.id
-
     try:
         if message.SUBCLASS_OF_ID == 0x790009e3:
             # hex(crc32(b'Message')) = 0x790009e3