diff --git a/pkg/action/hooks.go b/pkg/action/hooks.go
index 4bffb6ae0..bbf59a220 100644
--- a/pkg/action/hooks.go
+++ b/pkg/action/hooks.go
@@ -22,7 +22,6 @@ import (
 
 	"github.com/pkg/errors"
 
-	"helm.sh/helm/v3/pkg/kube"
 	"helm.sh/helm/v3/pkg/release"
 	helmtime "helm.sh/helm/v3/pkg/time"
 )
@@ -139,10 +138,8 @@ func (cfg *Configuration) deleteHookByPolicy(h *release.Hook, policy release.Hoo
 		}
 
 		//wait for resources until they are deleted to avoid conflicts
-		if kubeClient, ok := cfg.KubeClient.(kube.InterfaceExt); ok {
-			if err := kubeClient.WaitForDelete(resources, timeout); err != nil {
-				return err
-			}
+		if err := cfg.KubeClient.WaitForDelete(resources, timeout); err != nil {
+			return err
 		}
 	}
 	return nil
diff --git a/pkg/action/uninstall.go b/pkg/action/uninstall.go
index ac0c4fee8..f5b26ba75 100644
--- a/pkg/action/uninstall.go
+++ b/pkg/action/uninstall.go
@@ -131,10 +131,8 @@ func (u *Uninstall) Run(name string) (*release.UninstallReleaseResponse, error)
 	res.Info = kept
 
 	if u.Wait {
-		if kubeClient, ok := u.cfg.KubeClient.(kube.InterfaceExt); ok {
-			if err := kubeClient.WaitForDelete(deletedResources, u.Timeout); err != nil {
-				errs = append(errs, err)
-			}
+		if err := u.cfg.KubeClient.WaitForDelete(deletedResources, u.Timeout); err != nil {
+			errs = append(errs, err)
 		}
 	}
 
diff --git a/pkg/kube/interface.go b/pkg/kube/interface.go
index ce42ed950..b89434d10 100644
--- a/pkg/kube/interface.go
+++ b/pkg/kube/interface.go
@@ -70,12 +70,7 @@ type Interface interface {
 
 	// IsReachable checks whether the client is able to connect to the cluster.
 	IsReachable() error
-}
 
-// InterfaceExt is introduced to avoid breaking backwards compatibility for Interface implementers.
-//
-// TODO Helm 4: Remove InterfaceExt and integrate its method(s) into the Interface.
-type InterfaceExt interface {
 	// WaitForDelete wait up to the given timeout for the specified resources to be deleted.
 	WaitForDelete(resources ResourceList, timeout time.Duration) error
 }
@@ -111,6 +106,5 @@ type InterfaceResources interface {
 }
 
 var _ Interface = (*Client)(nil)
-var _ InterfaceExt = (*Client)(nil)
 var _ InterfaceDeletionPropagation = (*Client)(nil)
 var _ InterfaceResources = (*Client)(nil)