HAProxy Invalid Address

I'm running haproxy 1.5.14 on Centos 7.1. Here's my config:

global
        chroot  /var/lib/haproxy
        pidfile /var/run/haproxy.pid
        user    haproxy
        group   haproxy
        maxconn 4096
        log     127.0.0.1 local0
        log     127.0.0.1 local1 notice
        stats   socket /var/lib/haproxy/stats mode 666 level admin
defaults
        log      global
        option   dontlognull
        maxconn  2000
        retries  3
        timeout  connect 5s
        timeout  client  1m
        timeout  server  1m
        option   redispatch
        balance  roundrobin

listen stats
        mode http
        bind 0.0.0.0:3212
        timeout  connect 5s
        timeout  client  1m
        timeout  server  1m
        stats enable
        stats uri /
        stats refresh 5s

frontend registry
        bind 192.168.1.43:5001
        mode http
        bind localhost:5001
        default_backend registry

backend registry
        mode http
        server my-server:5000_my-server my-server:5000 cookie my-server:5000_my-server check inter 30s fastinter 2s rise 1 fall 3

I can ping and do nslookup's on my-server fine but when I start haproxy I'm getting the following error:

Jun  8 17:50:28 localhost haproxy-systemd-wrapper: [ALERT] 159/175028 (13407):
parsing [/etc/haproxy/haproxy.cfg:42] : 'server my-server:5000_my-server' : invalid address: 'my-server' in 'my-server:5000'

When I add my-server to /etc/hosts HAProxy works fine. However, I've got additional services/servers to add an I need DNS resolution working for this.

How can I get haproxy to talk to my DNS server to resolve my hostnames?

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