CentOS - Dec 2014 - Fetchmail multiple instances increasing load average

Kindly suggest is  this right way to start the cronjob with lock  if i've
not mis understood.

*/5 * * * * /usr/bin/flock -n */etc/webmin/fetchmail/check.pl
<http://check.pl>
*>* --file /var/log/fetchmaillog*



Warm Regards,
Anshul Chauhan