diff --git a/pkg/config/types.go b/pkg/config/types.go
index 44682986..7b917087 100644
--- a/pkg/config/types.go
+++ b/pkg/config/types.go
@@ -11,7 +11,10 @@ const (
 	NetworkRolePrimary NetworkRole = "primary"
 )
 
-const OVNPrimaryNetworkIPAMClaimAnnotation = "k8s.ovn.org/primary-udn-ipamclaim"
+const (
+	MultusDefaultNetwork = "v1.multus-cni.io/default-network"
+	DefaultNetworkName   = "ovn-kubernetes"
+)
 
 type RelevantConfig struct {
 	Name               string      `json:"name"`
diff --git a/pkg/ipamclaimswebhook/podmutator.go b/pkg/ipamclaimswebhook/podmutator.go
index 9745bcf4..52bbc0b0 100644
--- a/pkg/ipamclaimswebhook/podmutator.go
+++ b/pkg/ipamclaimswebhook/podmutator.go
@@ -109,7 +109,10 @@ func (a *IPAMClaimsValet) Handle(ctx context.Context, request admission.Request)
 		if newPod == nil {
 			newPod = pod.DeepCopy()
 		}
-		updatePodWithOVNPrimaryNetworkIPAMClaimAnnotation(newPod, newPrimaryNetworkIPAMClaimName)
+		if err = updatePodWithDefaultNetworkAnnotation(a.Client, newPod, newPrimaryNetworkIPAMClaimName); err != nil {
+			return admission.Errored(http.StatusInternalServerError,
+				fmt.Errorf("failed updating default network annotation: %v", err))
+		}
 	}
 
 	if newPod != nil {
@@ -159,8 +162,33 @@ func updatePodSelectionElements(pod *corev1.Pod, networks []*v1.NetworkSelection
 	return nil
 }
 
-func updatePodWithOVNPrimaryNetworkIPAMClaimAnnotation(pod *corev1.Pod, primaryNetworkIPAMClaimName string) {
-	pod.Annotations[config.OVNPrimaryNetworkIPAMClaimAnnotation] = primaryNetworkIPAMClaimName
+func updatePodWithDefaultNetworkAnnotation(cli client.Client, pod *corev1.Pod, ipamClaimName string) error {
+	nadKey := types.NamespacedName{
+		Namespace: "default",
+		Name:      config.DefaultNetworkName,
+	}
+
+	nad := v1.NetworkAttachmentDefinition{}
+	if err := cli.Get(context.Background(), nadKey, &nad); err != nil {
+		return err
+	}
+
+	networkAnnotation := []v1.NetworkSelectionElement{
+		{
+			Namespace:          "default",
+			Name:               config.DefaultNetworkName,
+			IPAMClaimReference: ipamClaimName,
+		},
+	}
+
+	annotationBytes, err := json.Marshal(networkAnnotation)
+	if err != nil {
+		return err
+	}
+
+	pod.Annotations[config.MultusDefaultNetwork] = string(annotationBytes)
+
+	return nil
 }
 
 func ensureIPAMClaimRefAtNetworkSelectionElements(ctx context.Context,
@@ -236,9 +264,7 @@ func ensureIPAMClaimRefAtNetworkSelectionElements(ctx context.Context,
 func findNewPrimaryNetworkIPAMClaimName(ctx context.Context,
 	cli client.Client, pod *corev1.Pod, vmName string) (string, error) {
 	log := logf.FromContext(ctx)
-	if pod.Annotations[config.OVNPrimaryNetworkIPAMClaimAnnotation] != "" {
-		return "", nil
-	}
+
 	primaryNetworkNAD, err := udn.FindPrimaryNetwork(ctx, cli, pod.Namespace)
 	if err != nil {
 		return "", err
diff --git a/pkg/ipamclaimswebhook/podmutator_test.go b/pkg/ipamclaimswebhook/podmutator_test.go
index 448c1d88..c241302f 100644
--- a/pkg/ipamclaimswebhook/podmutator_test.go
+++ b/pkg/ipamclaimswebhook/podmutator_test.go
@@ -31,6 +31,8 @@ import (
 
 	ipamclaimsapi "github.com/k8snetworkplumbingwg/ipamclaims/pkg/crd/ipamclaims/v1alpha1"
 	nadv1 "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/apis/k8s.cni.cncf.io/v1"
+
+	"github.com/kubevirt/ipam-extensions/pkg/config"
 )
 
 type testConfig struct {
@@ -136,6 +138,7 @@ var _ = Describe("KubeVirt IPAM launcher pod mutato machine", Serial, func() {
 			inputNADs: []*nadv1.NetworkAttachmentDefinition{
 				dummyNAD(nadName),
 				dummyPrimaryNetworkNAD(nadName),
+				dummyDefaultNetworkNAD(),
 			},
 			inputPod: dummyPodForVM(nadName, vmName),
 			expectedAdmissionResponse: admission.Response{
@@ -146,8 +149,8 @@ var _ = Describe("KubeVirt IPAM launcher pod mutato machine", Serial, func() {
 				Patches: []jsonpatch.JsonPatchOperation{
 					{
 						Operation: "add",
-						Path:      "/metadata/annotations/k8s.ovn.org~1primary-udn-ipamclaim",
-						Value:     "vm1.podnet",
+						Path:      "/metadata/annotations/v1.multus-cni.io~1default-network",
+						Value:     "[{\"name\":\"ovn-kubernetes\",\"namespace\":\"default\",\"ipam-claim-reference\":\"vm1.podnet\"}]",
 					},
 					{
 						Operation: "replace",
@@ -163,6 +166,7 @@ var _ = Describe("KubeVirt IPAM launcher pod mutato machine", Serial, func() {
 			inputVMI: dummyVMI(nadName),
 			inputNADs: []*nadv1.NetworkAttachmentDefinition{
 				dummyPrimaryNetworkNAD(nadName),
+				dummyDefaultNetworkNAD(),
 			},
 			inputPod: dummyPodForVM("" /*without network selection element*/, vmName),
 			expectedAdmissionResponse: admission.Response{
@@ -173,8 +177,8 @@ var _ = Describe("KubeVirt IPAM launcher pod mutato machine", Serial, func() {
 				Patches: []jsonpatch.JsonPatchOperation{
 					{
 						Operation: "add",
-						Path:      "/metadata/annotations/k8s.ovn.org~1primary-udn-ipamclaim",
-						Value:     "vm1.podnet",
+						Path:      "/metadata/annotations/v1.multus-cni.io~1default-network",
+						Value:     "[{\"name\":\"ovn-kubernetes\",\"namespace\":\"default\",\"ipam-claim-reference\":\"vm1.podnet\"}]",
 					},
 				},
 			},
@@ -349,6 +353,10 @@ func dummyNADWithoutPersistentIPs(nadName string) *nadv1.NetworkAttachmentDefini
 	return dummyNADWithConfig(nadName, `{"name": "goodnet"}`)
 }
 
+func dummyDefaultNetworkNAD() *nadv1.NetworkAttachmentDefinition {
+	return dummyNADWithConfig("default/"+config.DefaultNetworkName, "")
+}
+
 func podAdmissionRequest(pod *corev1.Pod) admission.Request {
 	rawPod, err := json.Marshal(pod)
 	if err != nil {