diff --git a/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml b/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
index 80965ec6a..816b14fa4 100644
--- a/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
+++ b/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
@@ -142,11 +142,7 @@ kube-prometheus-stack:
       externalUrl: https://prometheus-cl01tl.boreal-beaufort.ts.net
       serviceMonitorSelectorNilUsesHelmValues: false
       podMonitorSelectorNilUsesHelmValues: false
-      volumes:
-        - name: prometheus
-          persistentVolumeClaim:
-            claimName: kube-prometheus-stack-iscsi-storage
-      volumeMounts:
-        - name: prometheus
-          mountPath: /prometheus
-          readOnly: false
+      storageSpec:
+        volumeClaimTemplate:
+          spec:
+            volumeName: kube-prometheus-stack-iscsi-storage