diff --git a/xCAT-server/lib/xcat/plugins/grub2.pm b/xCAT-server/lib/xcat/plugins/grub2.pm
index 04650a69d..bb2e0ed15 100644
--- a/xCAT-server/lib/xcat/plugins/grub2.pm
+++ b/xCAT-server/lib/xcat/plugins/grub2.pm
@@ -248,7 +248,7 @@ sub setstate {
     }
   
     if ($nodemac =~ /:/) {
-        my $tmp = $nodemac;
+        my $tmp = lc($nodemac);
         $tmp =~ s/(..):(..):(..):(..):(..):(..)/$1-$2-$3-$4-$5-$6/g;
         my $pname = "grub.cfg-01-" . $tmp;
         unlink($tftpdir."/boot/grub2/".$pname);
diff --git a/xCAT-server/lib/xcat/plugins/yaboot.pm b/xCAT-server/lib/xcat/plugins/yaboot.pm
index 3ce67366f..6d08786c8 100644
--- a/xCAT-server/lib/xcat/plugins/yaboot.pm
+++ b/xCAT-server/lib/xcat/plugins/yaboot.pm
@@ -289,7 +289,7 @@ sub setstate {
     }
   }
   if ($nodemac =~ /:/) {
-      my $tmp = $nodemac;
+      my $tmp =lc($nodemac);
       $tmp =~ s/(..):(..):(..):(..):(..):(..)/$1-$2-$3-$4-$5-$6/g;
       my $pname = "yaboot.conf-" . $tmp;
       unlink($tftpdir."/".$pname);