diff --git a/kubernetes/main/apps/observability/grafana/app/helmrelease.yaml b/kubernetes/main/apps/observability/grafana/app/helmrelease.yaml
index 39e3ec83b..8d4872e02 100644
--- a/kubernetes/main/apps/observability/grafana/app/helmrelease.yaml
+++ b/kubernetes/main/apps/observability/grafana/app/helmrelease.yaml
@@ -239,7 +239,7 @@ spec:
       enabled: true
       annotations:
         external-dns.alpha.kubernetes.io/target: internal.${PUBLIC_DOMAIN}
-      ingressClassName: internal
+        kubernetes.io/ingress.class: internal
       hosts: ["grafana.${PUBLIC_DOMAIN}"]
     persistence:
       enabled: false
diff --git a/kubernetes/main/apps/observability/kube-prometheus-stack/app/helmrelease.yaml b/kubernetes/main/apps/observability/kube-prometheus-stack/app/helmrelease.yaml
index c07bf5899..5c42cf721 100644
--- a/kubernetes/main/apps/observability/kube-prometheus-stack/app/helmrelease.yaml
+++ b/kubernetes/main/apps/observability/kube-prometheus-stack/app/helmrelease.yaml
@@ -39,7 +39,7 @@ spec:
         enabled: true
         annotations:
           external-dns.alpha.kubernetes.io/target: internal.${PUBLIC_DOMAIN}
-        ingressClassName: internal
+          kubernetes.io/ingress.class: internal
         hosts: ["alertmanager.${PUBLIC_DOMAIN}"]
         pathType: Prefix
       alertmanagerSpec:
@@ -73,7 +73,7 @@ spec:
         enabled: true
         annotations:
           external-dns.alpha.kubernetes.io/target: internal.${PUBLIC_DOMAIN}
-        ingressClassName: internal
+          kubernetes.io/ingress.class: internal
         hosts: ["prometheus.${PUBLIC_DOMAIN}"]
         pathType: Prefix
       prometheusSpec: