diff --git a/lib/nat/structs_test.go b/lib/nat/structs_test.go
index bedb3dda9..08f4e02ca 100644
--- a/lib/nat/structs_test.go
+++ b/lib/nat/structs_test.go
@@ -70,7 +70,7 @@ func TestMappingClearAddresses(t *testing.T) {
 	natSvc := NewService(protocol.EmptyDeviceID, w)
 	// Mock a mapped port; avoids the need to actually map a port
 	ip := net.ParseIP("192.168.0.1")
-	m := natSvc.NewMapping(TCP, ip, 1024)
+	m := natSvc.NewMapping(TCP, IPv4Only, ip, 1024)
 	m.extAddresses["test"] = []Address{{
 		IP:   ip,
 		Port: 1024,