diff --git a/synapse/federation/units.py b/synapse/federation/units.py
index 3f645acc430b7e381bdab375c341194f0b98d632..01c5b8fe17fa152d0de106bd147c2cef5a3e8952 100644
--- a/synapse/federation/units.py
+++ b/synapse/federation/units.py
@@ -74,8 +74,6 @@ class Transaction(JsonEncodedObject):
         "previous_ids",
         "pdus",
         "edus",
-        "transaction_id",
-        "destination",
         "pdu_failures",
     ]