diff --git a/cluster/gce/trusty/configure-helper.sh b/cluster/gce/trusty/configure-helper.sh
index 0b7edfe3de1..a54009597a8 100644
--- a/cluster/gce/trusty/configure-helper.sh
+++ b/cluster/gce/trusty/configure-helper.sh
@@ -628,7 +628,7 @@ start_kube_apiserver() {
     params="${params} --advertise-address=${vm_external_ip}"
     params="${params} --ssh-user=${PROXY_SSH_USER}"
     params="${params} --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile"
-  else [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]
+  elif [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]; then
     params="${params} --advertise-address=${MASTER_ADVERTISE_ADDRESS}"
   fi
   readonly kube_apiserver_docker_tag=$(cat /home/kubernetes/kube-docker-files/kube-apiserver.docker_tag)