diff --git a/tests/commands/test_commands.py b/tests/commands/test_commands.py
index 10e41205..82772585 100644
--- a/tests/commands/test_commands.py
+++ b/tests/commands/test_commands.py
@@ -392,7 +392,7 @@ def test_upsert_validator_new_without_tendermint(b, priv_validator_path, user_sk
         ]
 
     def mock_write(tx, mode):
-        b.store_transaction(tx)
+        b.store_bulk_transactions([tx])
         return (202, '')
 
     b.get_validators = mock_get