dhcp problem

I m trying to bind an IP address on behalf of its mac address but i m getting following error message

service dhcpd restart
Internet Systems Consortium DHCP Server V3.0.1
Copyright 2004 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
/etc/dhcpd.conf line 29: Bogus number: 00-13-20-13-A9-1B.
hardware ethernet 00-13-20-13-A9-1B;
^
Configuration file errors encountered — exiting