diff --git a/conservancy_beancount/data.py b/conservancy_beancount/data.py
index b6903d30ec98aae486514d2e41efd997baa5eab9..351698a0769c47bd0e4a1ae471d2c5f8c0e2842b 100644
--- a/conservancy_beancount/data.py
+++ b/conservancy_beancount/data.py
@@ -139,7 +139,7 @@ class Amount(bc_amount.Amount):
     # It works fine if you use super(), which is better practice anyway.
     # So we override __new__ just to call _Amount.__new__ this way.
     def __new__(cls, number: decimal.Decimal, currency: str) -> 'Amount':
-        return super(bc_amount._Amount, Amount).__new__(cls, number, currency)
+        return super(bc_amount.Amount, Amount).__new__(cls, number, currency)
 
 
 class Metadata(MutableMapping[MetaKey, MetaValue]):