diff --git a/libervia/backend/core/core_types.py b/libervia/backend/core/core_types.py
index f91cc1d0..d105b451 100644
--- a/libervia/backend/core/core_types.py
+++ b/libervia/backend/core/core_types.py
@@ -105,7 +105,7 @@ class SatXMPPEntity(ABC):
     # Map from (from_jid, message_id) to internal uid.
     # This is updated when message are received during message parsing, and this is
     # available only for message received during this session.
-    mess_id2uid: dict[tuple[str, str], str]
+    mess_id2uid: dict[tuple[t_jid.JID, str], str]
     # Fire when entity is connected
     conn_deferred: defer.Deferred
     xmlstream: mod_xmlstream.XmlStream