diff --git a/charts/maddy/templates/mta-sts.yaml b/charts/maddy/templates/mta-sts.yaml
index bad3794..dd57797 100644
--- a/charts/maddy/templates/mta-sts.yaml
+++ b/charts/maddy/templates/mta-sts.yaml
@@ -17,7 +17,7 @@
   name: mta-sts.{{ .Values.ingress.public.domain }}
   namespace: {{ .Release.Namespace }}
   annotations:
-    "helm.sh/resource-policy": keep
+    helm.sh/resource-policy: keep
 spec:
   dnsNames:
   - 'mta-sts.{{ .Values.ingress.public.domain }}'