diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index b16097caa2..3a4b4be7d5 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1321,7 +1321,6 @@ class FederationHandler(BaseHandler):
                 sender, target, event.room_id,
             )
 
-        FrozenEvent.from_event(event)
         event.unsigned.pop("invite_room_state", None)
         defer.returnValue(event)