diff --git a/deploy/charts/cert-manager/templates/service.yaml b/deploy/charts/cert-manager/templates/service.yaml
index 9c0a1adce..754902220 100644
--- a/deploy/charts/cert-manager/templates/service.yaml
+++ b/deploy/charts/cert-manager/templates/service.yaml
@@ -19,6 +19,7 @@ spec:
   ports:
     - protocol: TCP
       port: 9402
+      name: tcp-prometheus-servicemonitor
       targetPort: {{ .Values.prometheus.servicemonitor.targetPort }}
   selector:
     app.kubernetes.io/name: {{ include "cert-manager.name" . }}