diff --git a/deploy/knative/zitadel-knative-service.yaml b/deploy/knative/zitadel-knative-service.yaml
index a46c4c286..05486f49c 100644
--- a/deploy/knative/zitadel-knative-service.yaml
+++ b/deploy/knative/zitadel-knative-service.yaml
@@ -25,7 +25,7 @@ spec:
         - name: ZITADEL_TLS_ENABLED
           value: "false"
         - name: ZITADEL_EXTERNALPORT
-          value: 80
+          value: "80"
         - name: ZITADEL_EXTERNALDOMAIN
           value: zitadel.default.127.0.0.1.sslip.io
         image: ghcr.io/zitadel/zitadel:stable