diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index 3c23f29215..b5031f5c77 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -68,7 +68,10 @@ class RoomStore(SQLBaseStore):
         """
         query = RoomsTable.select_statement("room_id=?")
         return self._execute(
-            "get_room", RoomsTable.decode_single_result, query, room_id,
+            "get_room",
+            lambda txn: RoomsTable.decode_single_result(txn.fetchall()),
+            query,
+            room_id,
         )
 
     @defer.inlineCallbacks
diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
index b5ed5453d8..92eec69ef4 100644
--- a/synapse/storage/transactions.py
+++ b/synapse/storage/transactions.py
@@ -122,7 +122,7 @@ class TransactionStore(SQLBaseStore):
             )
 
         txn.execute(query, (destination,))
-        results = SentTransactions.decode_results(txn)
+        results = SentTransactions.decode_results(txn.fetchall())
 
         prev_txns = [r.transaction_id for r in results]