diff --git a/xCAT-server/lib/xcat/plugins/mknb.pm b/xCAT-server/lib/xcat/plugins/mknb.pm
index 8508a598a..76e0b2a05 100644
--- a/xCAT-server/lib/xcat/plugins/mknb.pm
+++ b/xCAT-server/lib/xcat/plugins/mknb.pm
@@ -3,6 +3,7 @@ use strict;
 use File::Temp qw(tempdir);
 use xCAT::Utils;
 use xCAT::TableUtils;
+use xCAT::NodeRange;
 use File::Path;
 use File::Copy;