diff --git a/parts/k8s/kubernetesmastercustomdata.yml b/parts/k8s/kubernetesmastercustomdata.yml
index 1c17267478..3bdbd20ba5 100644
--- a/parts/k8s/kubernetesmastercustomdata.yml
+++ b/parts/k8s/kubernetesmastercustomdata.yml
@@ -354,7 +354,7 @@ coreos:
         ExecStart=/opt/azure/containers/provision-setup.sh
 {{else}}
 runcmd:
-- retrycmd_if_failure() { for i in {1..5}; do $@; [ $? -eq 0  ] && break || sleep 5; done ; }
+- retrycmd_if_failure() { for i in $(seq 1 5); do $@; [ $? -eq 0  ] && break || sleep 5; done ; }
 - /opt/azure/containers/setup-etcd.sh
 - apt-mark hold walinuxagent {{GetKubernetesMasterPreprovisionYaml}}
 - /bin/echo DAEMON_ARGS=--name "{{WrapAsVerbatim "variables('masterVMNames')[copyIndex(variables('masterOffset'))]"}}" --peer-client-cert-auth --peer-trusted-ca-file={{WrapAsVariable "etcdCaFilepath"}} --peer-cert-file={{WrapAsVerbatim "variables('etcdPeerCertFilepath')[copyIndex(variables('masterOffset'))]"}} --peer-key-file={{WrapAsVerbatim "variables('etcdPeerKeyFilepath')[copyIndex(variables('masterOffset'))]"}} --initial-advertise-peer-urls "{{WrapAsVerbatim "variables('masterEtcdPeerURLs')[copyIndex(variables('masterOffset'))]"}}" --listen-peer-urls "{{WrapAsVerbatim "variables('masterEtcdPeerURLs')[copyIndex(variables('masterOffset'))]"}}" --client-cert-auth --trusted-ca-file={{WrapAsVariable "etcdCaFilepath"}} --cert-file={{WrapAsVariable "etcdServerCertFilepath"}} --key-file={{WrapAsVariable "etcdServerKeyFilepath"}} --advertise-client-urls "{{WrapAsVerbatim "variables('masterEtcdClientURLs')[copyIndex(variables('masterOffset'))]"}}" --listen-client-urls "{{WrapAsVerbatim "concat(variables('masterEtcdClientURLs')[copyIndex(variables('masterOffset'))], ',https://127.0.0.1:', variables('masterEtcdClientPort'))"}}" --initial-cluster-token "k8s-etcd-cluster" --initial-cluster "{{WrapAsVerbatim "variables('masterEtcdClusterStates')[div(variables('masterCount'), 2)]"}} --data-dir "/var/lib/etcddisk"" --initial-cluster-state "new" | tee -a /etc/default/etcd