diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index 6a1ee4d50..da8e4117e 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -1150,15 +1150,15 @@ sub mkinitrd_dracut {
     # force the dracut run in non-hostonly mode for dracut higher than version 033
     if ($dracutver > "033") {
         $additional_options .= " -N";
-    }
 
-    #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
-    my $compress = qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
-    if ($compress) {
+        #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
+        my $compress = qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
+        if ($compress) {
 
-        #take the online cpu numerber as the pigz processes number
-        my $processnum = qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
-        $additional_options .= " --compress \"$compress -p $processnum \"";
+            #take the online cpu numerber as the pigz processes number
+            my $processnum = qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
+            $additional_options .= " --compress \"$compress -p $processnum \"";
+        }
     }
 
     print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";