diff --git a/scripts/synapse_port_db b/scripts/synapse_port_db
index dc7fe940e..a7a50e4d3 100755
--- a/scripts/synapse_port_db
+++ b/scripts/synapse_port_db
@@ -112,6 +112,7 @@ class Store(object):
 
     _simple_update_one = SQLBaseStore.__dict__["_simple_update_one"]
     _simple_update_one_txn = SQLBaseStore.__dict__["_simple_update_one_txn"]
+    _simple_update_txn = SQLBaseStore.__dict__["_simple_update_txn"]
 
     def runInteraction(self, desc, func, *args, **kwargs):
         def r(conn):