diff --git a/util/src/test/java/org/killbill/billing/mock/api/MockAccountUserApi.java b/util/src/test/java/org/killbill/billing/mock/api/MockAccountUserApi.java
index 18e47eb..d4c3c51 100644
--- a/util/src/test/java/org/killbill/billing/mock/api/MockAccountUserApi.java
+++ b/util/src/test/java/org/killbill/billing/mock/api/MockAccountUserApi.java
@@ -167,4 +167,10 @@ public class MockAccountUserApi implements AccountUserApi {
throws AccountApiException {
throw new UnsupportedOperationException();
}
+
+ @Override
+ public List<Account> getChildAccounts(final UUID uuid, final TenantContext tenantContext) throws AccountApiException {
+ // TODO implement
+ return null;
+ }
}