diff --git a/charts/headlamp/templates/pvc.yaml b/charts/headlamp/templates/pvc.yaml
index c88b49d6d0..3c9ec9335d 100644
--- a/charts/headlamp/templates/pvc.yaml
+++ b/charts/headlamp/templates/pvc.yaml
@@ -17,7 +17,7 @@ spec:
   {{- end}}
   resources:
     requests:
-      storage: {{ .Values.persistentVolumeClaim.size }}
+      storage: {{ required "A valid .Values.persistentVolumeClaim.size entry required!" .Values.persistentVolumeClaim.size }}
   {{- with .Values.persistentVolumeClaim.volumeMode }}
   volumeMode: {{ . }}
   {{- end }}