diff --git a/pkg/openstack/nova.go b/pkg/openstack/nova.go
index ca2e561e7..e1305818f 100644
--- a/pkg/openstack/nova.go
+++ b/pkg/openstack/nova.go
@@ -273,7 +273,7 @@ func ReconcileNova(ctx context.Context, instance *corev1beta1.OpenStackControlPl
 					certRequest := certmanager.CertificateRequest{
 						IssuerName: instance.GetLibvirtIssuer(),
 						CertName:   nova.Name + "-novncproxy-" + cellName + "-vencrypt",
-						CommonName: ptr.To(fmt.Sprintf("%s.%s.svc", serviceName, instance.Namespace)),
+						CommonName: ptr.To(serviceName),
 						Subject: &certmgrv1.X509Subject{
 							Organizations: []string{fmt.Sprintf("%s.%s", instance.Namespace, ClusterInternalDomain)},
 						},