diff --git a/tests/unit/test_coinselection.py b/tests/unit/test_coinselection.py
index b304fdefb..b2adbbd92 100644
--- a/tests/unit/test_coinselection.py
+++ b/tests/unit/test_coinselection.py
@@ -19,7 +19,7 @@ def search(*args, **kwargs):
 class BaseSelectionTestCase(unittest.TestCase):
 
     def setUp(self):
-        self.ledger = MainNetLedger(db=MainNetLedger.database_class(':memory:'))
+        self.ledger = MainNetLedger({'db': MainNetLedger.database_class(':memory:')})
         return self.ledger.db.start()
 
     def estimates(self, *args):