diff --git a/tests/unit/wallet/test_transaction.py b/tests/unit/wallet/test_transaction.py
index 509c09ba7..b12acc645 100644
--- a/tests/unit/wallet/test_transaction.py
+++ b/tests/unit/wallet/test_transaction.py
@@ -42,7 +42,8 @@ class TestSizeAndFeeEstimation(AsyncioTestCase):
     async def asyncSetUp(self):
         self.ledger = Ledger({
             'db': Database(':memory:'),
-            'headers': Headers(':memory:')
+            'headers': Headers(':memory:'),
+            'fee_per_name_char': 200_000
         })
         await self.ledger.db.open()