diff --git a/proxmoxtf/resource_virtual_environment_dns_test.go b/proxmoxtf/resource_virtual_environment_dns_test.go
index 9b84bd1b..0ba6ade8 100644
--- a/proxmoxtf/resource_virtual_environment_dns_test.go
+++ b/proxmoxtf/resource_virtual_environment_dns_test.go
@@ -26,6 +26,9 @@ func TestResourceVirtualEnvironmentDNSSchema(t *testing.T) {
 	testRequiredArguments(t, s, []string{
 		mkResourceVirtualEnvironmentDNSDomain,
 		mkResourceVirtualEnvironmentDNSNodeName,
+	})
+
+	testOptionalArguments(t, s, []string{
 		mkResourceVirtualEnvironmentDNSServers,
 	})