diff --git a/cw_core/test/amount/utils.dart b/cw_core/test/amount/utils.dart
index 70081e62d..4fbe1c6df 100644
--- a/cw_core/test/amount/utils.dart
+++ b/cw_core/test/amount/utils.dart
@@ -29,6 +29,9 @@ class FiatCurrency implements Currency {
   @override
   String? get tag => throw UnimplementedError();
 
+  @override
+  String get apiString => "fiat.$symbol";
+
   @override
   Money parseAmount(String value) => Money.parse(value, this);