diff --git a/integration_tests/lnd_mock.go b/integration_tests/lnd_mock.go
index 9f01a35..f76ca5a 100644
--- a/integration_tests/lnd_mock.go
+++ b/integration_tests/lnd_mock.go
@@ -101,6 +101,7 @@ func (mlnd *MockLND) AddInvoice(ctx context.Context, req *lnrpc.Invoice, options
 		},
 		FallbackAddr: nil,
 	}
+	zpay32.Expiry(time.Duration(req.Expiry) * time.Second)(invoice)
 	copy(invoice.PaymentHash[:], pHash.Sum(nil))
 	copy(invoice.PaymentAddr[:], req.PaymentAddr)
 	if len(req.DescriptionHash) != 0 {