diff --git a/app/utils/precheck.py b/app/utils/precheck.py
index bfd9911..d499360 100644
--- a/app/utils/precheck.py
+++ b/app/utils/precheck.py
@@ -61,7 +61,7 @@ async def inbox_prechecker(
     _actor = await fetch_actor(db_session, actor_id)
 
     try:
-        pubkey = _actor["publicKey"]["publicKeyPem"]
+        pubkey = _actor.ap_actor["publicKey"]["publicKeyPem"]
     except json.JSONDecodeError:
         raise ValueError
     except KeyError: