diff --git a/src/test/java/uk/gov/pay/ledger/pact/ContractTest.java b/src/test/java/uk/gov/pay/ledger/pact/ContractTest.java
index cc2181476..3889ea98f 100644
--- a/src/test/java/uk/gov/pay/ledger/pact/ContractTest.java
+++ b/src/test/java/uk/gov/pay/ledger/pact/ContractTest.java
@@ -446,6 +446,7 @@ public void createThreePaymentsWithPaidoutDates(Map<String, String> params) {
                 .insert(app.getJdbi());
         aTransactionFixture()
                 .withTransactionType("REFUND")
+                .withParentExternalId(randomAlphanumeric(15))
                 .withGatewayAccountId(gatewayAccountId)
                 .withGatewayPayoutId(gatewayPayoutId4)
                 .insert(app.getJdbi());