diff --git a/internal/test/envtest/environment.go b/internal/test/envtest/environment.go
index 5ac894675e29..90148275d8cc 100644
--- a/internal/test/envtest/environment.go
+++ b/internal/test/envtest/environment.go
@@ -72,7 +72,6 @@ import (
 	expapiwebhooks "sigs.k8s.io/cluster-api/exp/webhooks"
 	"sigs.k8s.io/cluster-api/feature"
 	internalwebhooks "sigs.k8s.io/cluster-api/internal/webhooks"
-	runtimewebhooks "sigs.k8s.io/cluster-api/internal/webhooks/runtime"
 	"sigs.k8s.io/cluster-api/util/kubeconfig"
 	"sigs.k8s.io/cluster-api/util/test/builder"
 	"sigs.k8s.io/cluster-api/version"
@@ -390,7 +389,7 @@ func newEnvironment(scheme *runtime.Scheme, additionalCRDDirectoryPaths []string
 	if err := (&expapiwebhooks.MachinePool{}).SetupWebhookWithManager(mgr); err != nil {
 		klog.Fatalf("unable to create webhook for machinepool: %+v", err)
 	}
-	if err := (&runtimewebhooks.ExtensionConfig{}).SetupWebhookWithManager(mgr); err != nil {
+	if err := (&webhooks.ExtensionConfig{}).SetupWebhookWithManager(mgr); err != nil {
 		klog.Fatalf("unable to create webhook for extensionconfig: %+v", err)
 	}
 	if err := (&expipamwebhooks.IPAddress{}).SetupWebhookWithManager(mgr); err != nil {
diff --git a/main.go b/main.go
index fd39798a273b..b09815fa29af 100644
--- a/main.go
+++ b/main.go
@@ -83,7 +83,6 @@ import (
 	"sigs.k8s.io/cluster-api/internal/contract"
 	internalruntimeclient "sigs.k8s.io/cluster-api/internal/runtime/client"
 	runtimeregistry "sigs.k8s.io/cluster-api/internal/runtime/registry"
-	runtimewebhooks "sigs.k8s.io/cluster-api/internal/webhooks/runtime"
 	"sigs.k8s.io/cluster-api/util/apiwarnings"
 	"sigs.k8s.io/cluster-api/util/flags"
 	"sigs.k8s.io/cluster-api/version"
@@ -833,7 +832,7 @@ func setupWebhooks(ctx context.Context, mgr ctrl.Manager, clusterCacheReader web
 
 	// NOTE: ExtensionConfig is behind the RuntimeSDK feature gate flag. The webhook will prevent creating or updating
 	// new objects if the feature flag is disabled.
-	if err := (&runtimewebhooks.ExtensionConfig{}).SetupWebhookWithManager(mgr); err != nil {
+	if err := (&webhooks.ExtensionConfig{}).SetupWebhookWithManager(mgr); err != nil {
 		setupLog.Error(err, "Unable to create webhook", "webhook", "ExtensionConfig")
 		os.Exit(1)
 	}
diff --git a/webhooks/alias.go b/webhooks/alias.go
index 24637be90d28..a52055a0c2e2 100644
--- a/webhooks/alias.go
+++ b/webhooks/alias.go
@@ -25,6 +25,7 @@ import (
 
 	clusterv1 "sigs.k8s.io/cluster-api/api/core/v1beta2"
 	"sigs.k8s.io/cluster-api/internal/webhooks"
+	runtimewebhooks "sigs.k8s.io/cluster-api/internal/webhooks/runtime"
 )
 
 // Cluster implements a validating and defaulting webhook for Cluster.
@@ -125,3 +126,11 @@ type ClusterResourceSetBinding struct{}
 func (webhook *ClusterResourceSetBinding) SetupWebhookWithManager(mgr ctrl.Manager) error {
 	return (&webhooks.ClusterResourceSetBinding{}).SetupWebhookWithManager(mgr)
 }
+
+// ExtensionConfig implements a defaulting and validating webhook for ExtensionConfig.
+type ExtensionConfig struct{}
+
+// SetupWebhookWithManager sets up ClusterResourceSet webhooks.
+func (webhook *ExtensionConfig) SetupWebhookWithManager(mgr ctrl.Manager) error {
+	return (&runtimewebhooks.ExtensionConfig{}).SetupWebhookWithManager(mgr)
+}