diff --git a/charts/accurate/templates/certificate.yaml b/charts/accurate/templates/certificate.yaml
index bc1436a..14e3d0c 100644
--- a/charts/accurate/templates/certificate.yaml
+++ b/charts/accurate/templates/certificate.yaml
@@ -10,6 +10,7 @@ spec:
     - {{ template "accurate.fullname" . }}-webhook-service.{{ .Release.Namespace }}.svc
     - {{ template "accurate.fullname" . }}-webhook-service.{{ .Release.Namespace }}.svc.cluster.local
   issuerRef:
+    group: cert-manager.io
     kind: Issuer
     name: {{ template "accurate.fullname" . }}-selfsigned-issuer
   secretName: webhook-server-cert
diff --git a/config/certmanager/certificate.yaml b/config/certmanager/certificate.yaml
index 52d8661..e9e62c2 100644
--- a/config/certmanager/certificate.yaml
+++ b/config/certmanager/certificate.yaml
@@ -20,6 +20,7 @@ spec:
   - $(SERVICE_NAME).$(SERVICE_NAMESPACE).svc
   - $(SERVICE_NAME).$(SERVICE_NAMESPACE).svc.cluster.local
   issuerRef:
+    group: cert-manager.io
     kind: Issuer
     name: selfsigned-issuer
   secretName: webhook-server-cert # this secret will not be prefixed, since it's not managed by kustomize