diff --git a/xCAT-server/lib/perl/xCAT/Template.pm b/xCAT-server/lib/perl/xCAT/Template.pm
index 516d6b499..d0e53090a 100644
--- a/xCAT-server/lib/perl/xCAT/Template.pm
+++ b/xCAT-server/lib/perl/xCAT/Template.pm
@@ -106,7 +106,7 @@ sub subvars {
 
   #replace the env with the right value so that correct include files can be found
   $inc =~ s/#ENV:([^#]+)#/envvar($1)/eg;
-
+  my $res;
   if ($pkglistfile) {
       #substitute the tag #INCLUDE_DEFAULT_PKGLIST# with package file name (for full install of  rh, centos,SL, esx fedora)
       $inc =~ s/#INCLUDE_DEFAULT_PKGLIST#/#INCLUDE:$pkglistfile#/g;