tftpd-hpa using defaults instead of user configuration
 

I have been trying to get my tftp-hpa server up and running on my Ubuntu 8.04 (hardy) machine and have an issue.

I have changed /etc/default/tftp-hpa.conf to:
DAEMON="yes"
OPTIONS="-l -s /nfs/tftp"

But when I try and restart tftp-hpa with /etc/init.d/tftp-hpa restart (or stop and start) the default directory of /var/lib/tftpboot is still being used.

Anyone have any suggestions of what may be the issue?