[CentOS] dhcpd logging to dhcpd.log only

I've added this to my dhcpd.conf
log-facility local6;
and
added this to my syslog.conf
local6.*       /var/log/dhcpd.log

It's still writing to dhcpd info to both log files.
How do I stop this.

I've googled but all suggested modifications I've made to the dhcpd.conf 
causes dhcpd to not start.
Thanks
Dan