diff --git a/clusters/sit/podmonitor.yaml b/clusters/sit/podmonitor.yaml
index 8a960f8..1cd3435 100644
--- a/clusters/sit/podmonitor.yaml
+++ b/clusters/sit/podmonitor.yaml
@@ -21,7 +21,7 @@ spec:
           - image-automation-controller
           - image-reflector-controller
   podMetricsEndpoints:
-    - port: 8080
+    - port: "8080"
       relabelings:
         # https://github.com/prometheus-operator/prometheus-operator/issues/4816
         - sourceLabels: [__meta_kubernetes_pod_phase]