[CentOS] Sudo #includedir function ignored CentOS 6

I am unable to get the #includedir function to work with sudo.  This works
just fine on all my CentOS 5.6 servers, but on 6 it is being ignored.  I
have this line in the file /etc/sudoers.d/zabbix-puppet

zabbix ALL=NOPASSWD: /var/lib/zabbix/bin/start_puppet

However sudo still requires a password.  If I put that same line into
/etc/sudoers file , there is no password prompt.  At the end of my sudoers
file I have this line

#includedir "/etc/sudoers.d"

It seems that line is being ignored.

The permissions on the file in that directory are 0440.

Any ideas would be greatly appreciated.

Thanks
- Trey
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