diff --git a/charts/k3k/templates/crds/k3k.io_clusters.yaml b/charts/k3k/templates/crds/k3k.io_clusters.yaml
index 1e8b29e..e036f7b 100644
--- a/charts/k3k/templates/crds/k3k.io_clusters.yaml
+++ b/charts/k3k/templates/crds/k3k.io_clusters.yaml
@@ -443,6 +443,9 @@ spec:
                       This field is only relevant in "dynamic" mode.
                     pattern: ^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$
                     x-kubernetes-int-or-string: true
+                    x-kubernetes-validations:
+                    - message: storageRequestSize is immutable
+                      rule: self == oldSelf
                   type:
                     default: dynamic
                     description: Type specifies the persistence mode.
diff --git a/cli/cmds/cluster_create.go b/cli/cmds/cluster_create.go
index d4b9ab4..cb6af24 100644
--- a/cli/cmds/cluster_create.go
+++ b/cli/cmds/cluster_create.go
@@ -190,14 +190,14 @@ func createAction(appCtx *AppContext, config *CreateConfig) func(cmd *cobra.Comm
 }
 
 func newCluster(name, namespace string, config *CreateConfig) (*v1beta1.Cluster, error) {
-	var storageRequestSize resource.Quantity
+	var storageRequestSize *resource.Quantity
 	if config.storageRequestSize != "" {
 		parsed, err := resource.ParseQuantity(config.storageRequestSize)
 		if err != nil {
 			return nil, err
 		}
 
-		storageRequestSize = parsed
+		storageRequestSize = ptr.To(parsed)
 	}
 
 	cluster := &v1beta1.Cluster{
@@ -225,7 +225,7 @@ func newCluster(name, namespace string, config *CreateConfig) (*v1beta1.Cluster,
 			Persistence: v1beta1.PersistenceConfig{
 				Type:               v1beta1.PersistenceMode(config.persistenceType),
 				StorageClassName:   ptr.To(config.storageClassName),
-				StorageRequestSize: ptr.To(storageRequestSize),
+				StorageRequestSize: storageRequestSize,
 			},
 			MirrorHostNodes: config.mirrorHostNodes,
 		},
diff --git a/pkg/apis/k3k.io/v1beta1/types.go b/pkg/apis/k3k.io/v1beta1/types.go
index 069619f..6980bc4 100644
--- a/pkg/apis/k3k.io/v1beta1/types.go
+++ b/pkg/apis/k3k.io/v1beta1/types.go
@@ -364,6 +364,7 @@ type PersistenceConfig struct {
 	// This field is only relevant in "dynamic" mode.
 	//
 	// +kubebuilder:default="2G"
+	// +kubebuilder:validation:XValidation:message="storageRequestSize is immutable",rule="self == oldSelf"
 	// +optional
 	StorageRequestSize *resource.Quantity `json:"storageRequestSize,omitempty"`
 }