diff --git a/spotbot.py b/spotbot.py
index c0bd5d9..8961e0b 100644
--- a/spotbot.py
+++ b/spotbot.py
@@ -27,7 +27,7 @@ def combine_messages(self, m1, m2):
         return f"{m1}\n{m2}"
 
     def get_last_message(self):
-        last_message_entity = self.table.query_for_entity(self.callsign)
+        last_message_entity = self.table.query_for_entity(self.ham.callsign)
         if self.is_entity_recent(last_message_entity):
             messageId = last_message_entity['MessageId']
             existing_message = self.discord_http.get_message_from_id(messageId)