diff --git a/argocd/apps/tatort/tatort.yaml b/argocd/apps/tatort/tatort.yaml
index 41a8540..725b638 100644
--- a/argocd/apps/tatort/tatort.yaml
+++ b/argocd/apps/tatort/tatort.yaml
@@ -32,7 +32,7 @@ spec:
         - name: ingress.annotations.cert-manager\.io\/cluster-issuer
           value: lets-encrypt-staging
         - name: service.port
-          value: 4137
+          value: "4137"
     chart: tatort
   destination:
     server: 'https://kubernetes.default.svc'