diff --git a/matrix_appservice_kakaotalk/portal.py b/matrix_appservice_kakaotalk/portal.py
index 8fd5d59..a52310f 100644
--- a/matrix_appservice_kakaotalk/portal.py
+++ b/matrix_appservice_kakaotalk/portal.py
@@ -585,7 +585,7 @@ class Portal(DBPortal, BasePortal):
         await puppet.update_info_from_participant(source, participant)
         changed = False
         if self.is_direct and self._kt_sender == puppet.ktid and self.encrypted:
-            changed = await self._update_info_from_puppet(puppet.name) or changed
+            changed = await self.update_info_from_puppet(puppet.name) or changed
         if self.mxid:
             if puppet.ktid != self.kt_receiver or puppet.is_real_user:
                 await puppet.intent_for(self).ensure_joined(self.mxid, bot=self.main_intent)