diff --git a/lessons/013/04-ingress-nginx/controller-service-prometheus.yaml b/lessons/013/04-ingress-nginx/controller-service-prometheus.yaml
index 617442f..f4c6f3e 100644
--- a/lessons/013/04-ingress-nginx/controller-service-prometheus.yaml
+++ b/lessons/013/04-ingress-nginx/controller-service-prometheus.yaml
@@ -12,7 +12,7 @@ spec:
   ports:
     - name: prometheus
       port: 10254
-      targetPort: prometheus
+      targetPort: 10254
   selector:
     app.kubernetes.io/name: ingress-nginx
     app.kubernetes.io/component: controller