diff --git a/metropolis/node/kubernetes/apiserver.go b/metropolis/node/kubernetes/apiserver.go
index e3f0d98..39105b2 100644
--- a/metropolis/node/kubernetes/apiserver.go
+++ b/metropolis/node/kubernetes/apiserver.go
@@ -98,7 +98,7 @@
 		"--enable-admission-plugins=NodeRestriction,PodSecurityPolicy",
 		"--enable-aggregator-routing=true",
 		"--insecure-port=0",
-		fmt.Sprintf("--secure-port=%v", common.KubernetesAPIPort),
+		fmt.Sprintf("--secure-port=%d", common.KubernetesAPIPort),
 		fmt.Sprintf("--etcd-servers=unix:///%s:0", s.EphemeralConsensusDirectory.ClientSocket.FullPath()),
 		args.FileOpt("--kubelet-client-certificate", "kubelet-client-cert.pem",
 			pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: s.kubeletClientCert})),