diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 1cc820fb5b..eac110419c 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -146,7 +146,7 @@ class FederationHandler(BaseHandler):
                 # Huh, let's try and get the current state
                 try:
                     yield self.replication_layer.get_state_for_context(
-                        origin, event.room_id
+                        event.origin, event.room_id
                     )
 
                     hosts = yield self.store.get_joined_hosts_for_room(