diff --git a/telethon/client/chats.py b/telethon/client/chats.py
index 00ce95ca..b86b4fa5 100644
--- a/telethon/client/chats.py
+++ b/telethon/client/chats.py
@@ -864,8 +864,7 @@ class ChatMethods:
         """
         entity = await self.get_input_entity(entity)
         user = await self.get_input_entity(user)
-
-        if not isinstance(user, types.InputPeerUser):
+        if not isinstance(user, (types.InputPeerUser, types.InputPeerSelf)):
             raise ValueError('You must pass a user entity')
 
         perm_names = (