Why is xinetd ignoring 'bind' option?

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http://serverfault.com – On a server with proftpd controlled by xinetd (plesk/centos FWIW), I want to make proftpd listen only on a specific ip address. I've tried putting bind = in /etc/xinetd.d/ftp_psa, and also putting DefaultAddress in /etc/proftpd.conf, but it seems not to work. After I restart xinetd, nmap shows that port 21 is still being listened on for my other public ip. Can anyone tell me what I'm doing wrong? Just as a test I commented out the whole ftp service in the xinetd config file and that did disable the service, so I'm clearly in the right place, but the bind options see (HowTos)