diff --git a/pkg/features/kube_features.go b/pkg/features/kube_features.go
index 0bf79e5ddd7..911f8c5a4c1 100644
--- a/pkg/features/kube_features.go
+++ b/pkg/features/kube_features.go
@@ -533,6 +533,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	apiextensionsfeatures.CustomResourceSubresources:      {Default: true, PreRelease: featuregate.Beta},
 	apiextensionsfeatures.CustomResourceWebhookConversion: {Default: false, PreRelease: featuregate.Alpha},
 	apiextensionsfeatures.CustomResourcePublishOpenAPI:    {Default: true, PreRelease: featuregate.Beta},
+	apiextensionsfeatures.CustomResourceDefaulting:        {Default: false, PreRelease: featuregate.Alpha},
 
 	// features that enable backwards compatibility but are scheduled to be removed
 	// ...
diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/features/kube_features.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/features/kube_features.go
index 72ff90993ca..e5ed44f3cbf 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/features/kube_features.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/features/kube_features.go
@@ -53,6 +53,12 @@ const (
 	//
 	// CustomResourceWebhookConversion defines the webhook conversion for Custom Resources.
 	CustomResourceWebhookConversion featuregate.Feature = "CustomResourceWebhookConversion"
+
+	// owner: @sttts
+	// alpha: v1.15
+	//
+	// CustomResourceDefaulting enables OpenAPI defaulting in CustomResources.
+	CustomResourceDefaulting featuregate.Feature = "CustomResourceDefaulting"
 )
 
 func init() {
@@ -67,4 +73,5 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	CustomResourceSubresources:      {Default: true, PreRelease: featuregate.Beta},
 	CustomResourceWebhookConversion: {Default: false, PreRelease: featuregate.Alpha},
 	CustomResourcePublishOpenAPI:    {Default: true, PreRelease: featuregate.Beta},
+	CustomResourceDefaulting:        {Default: false, PreRelease: featuregate.Alpha},
 }