diff --git a/api/v1alpha1/etcdcluster_webhook.go b/api/v1alpha1/etcdcluster_webhook.go
index 1ad0976f..14e0bdbb 100644
--- a/api/v1alpha1/etcdcluster_webhook.go
+++ b/api/v1alpha1/etcdcluster_webhook.go
@@ -79,7 +79,8 @@ func (r *EtcdCluster) ValidateUpdate(old runtime.Object) (admission.Warnings, er
 	}
 
 	var allErrors field.ErrorList
-	if oldCluster.Spec.Storage.EmptyDir.String() != r.Spec.Storage.EmptyDir.String() {
+	if oldCluster.Spec.Storage.EmptyDir == nil && r.Spec.Storage.EmptyDir != nil ||
+		oldCluster.Spec.Storage.EmptyDir != nil && r.Spec.Storage.EmptyDir == nil {
 		allErrors = append(allErrors, field.Invalid(
 			field.NewPath("spec", "storage", "emptyDir"),
 			r.Spec.Storage.EmptyDir,
diff --git a/api/v1alpha1/etcdcluster_webhook_test.go b/api/v1alpha1/etcdcluster_webhook_test.go
index b4b191a6..1932a580 100644
--- a/api/v1alpha1/etcdcluster_webhook_test.go
+++ b/api/v1alpha1/etcdcluster_webhook_test.go
@@ -95,12 +95,28 @@ var _ = Describe("EtcdCluster Webhook", func() {
 					Storage:  StorageSpec{EmptyDir: nil},
 				},
 			}
-			w, err := etcdCluster.ValidateUpdate(oldCluster)
-			gomega.Expect(w).To(gomega.BeEmpty())
+			_, err := etcdCluster.ValidateUpdate(oldCluster)
 			if gomega.Expect(err).To(gomega.HaveOccurred()) {
 				statusErr := err.(*errors.StatusError)
 				gomega.Expect(statusErr.ErrStatus.Message).To(gomega.ContainSubstring("field is immutable"))
 			}
 		})
+
+		It("Should allow changing emptydir size", func() {
+			etcdCluster := &EtcdCluster{
+				Spec: EtcdClusterSpec{
+					Replicas: ptr.To(int32(1)),
+					Storage:  StorageSpec{EmptyDir: &corev1.EmptyDirVolumeSource{SizeLimit: ptr.To(resource.MustParse("4Gi"))}},
+				},
+			}
+			oldCluster := &EtcdCluster{
+				Spec: EtcdClusterSpec{
+					Replicas: ptr.To(int32(1)),
+					Storage:  StorageSpec{EmptyDir: &corev1.EmptyDirVolumeSource{SizeLimit: ptr.To(resource.MustParse("10Gi"))}},
+				},
+			}
+			_, err := etcdCluster.ValidateUpdate(oldCluster)
+			gomega.Expect(err).To(gomega.Succeed())
+		})
 	})
 })