diff --git a/metropolis/node/kubernetes/pki/kubernetes.go b/metropolis/node/kubernetes/pki/kubernetes.go
index a59ab98..0c795f2 100644
--- a/metropolis/node/kubernetes/pki/kubernetes.go
+++ b/metropolis/node/kubernetes/pki/kubernetes.go
@@ -213,7 +213,7 @@
 	kubeconfig := configapi.NewConfig()
 
 	cluster := configapi.NewCluster()
-	cluster.Server = fmt.Sprintf("https://127.0.0.1:%v", common.KubernetesAPIPort)
+	cluster.Server = fmt.Sprintf("https://127.0.0.1:%d", common.KubernetesAPIPort)
 
 	ca, err := c.Issuer.CACertificate(ctx, kv)
 	if err != nil {