diff --git a/xCAT-server/lib/perl/xCAT/Template.pm b/xCAT-server/lib/perl/xCAT/Template.pm
index c079d1411..b3d34af0c 100644
--- a/xCAT-server/lib/perl/xCAT/Template.pm
+++ b/xCAT-server/lib/perl/xCAT/Template.pm
@@ -355,6 +355,7 @@ sub windows_net_cfg {
 	my $suffix = $ent->{mac};
 	my $mac = $suffix;
 	$suffix = lc($suffix);
+    $mac =~ s/:/-/g;
 	unless ($hoststab) { $hoststab = xCAT::Table->new('hosts',-create=>1); }
 	my $ulaaddr = autoulaaddress($suffix);
 	$hoststab->setNodeAttribs($node,{ip=>$ulaaddr});