diff --git a/pgbotlib/response.py b/pgbotlib/response.py
index cbeac8a..9c02643 100644
--- a/pgbotlib/response.py
+++ b/pgbotlib/response.py
@@ -101,7 +101,8 @@ class Responder:
                       event: telethon.events.common.EventBuilder) -> None:
         if not self.enabled:
             return None
-        if event.message.peer_id not in self.chats:
+        chat_id = telethon.utils.get_peer_id(event.message.peer_id)
+        if chat_id not in self.chats:
             return None
         message = event.message.text.lower()
         tokens = self.tokenize(message)