diff --git a/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml b/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
index 3832b35ac..c02c3c307 100644
--- a/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
+++ b/clusters/cl01tl/monitoring/kube-prometheus-stack/values.yaml
@@ -155,5 +155,4 @@ kube-prometheus-stack:
       volumes:
         - name: migration
           mountPath: /migration
-          readOnly: false
           existingClaim: kube-prometheus-stack-iscsi-storage