diff --git a/xCAT-server/lib/xcat/plugins/makeknownhosts.pm b/xCAT-server/lib/xcat/plugins/makeknownhosts.pm
index 667af2f19..edfa0ee03 100644
--- a/xCAT-server/lib/xcat/plugins/makeknownhosts.pm
+++ b/xCAT-server/lib/xcat/plugins/makeknownhosts.pm
@@ -20,6 +20,7 @@ require xCAT::MsgUtils;
 use Getopt::Long;
 use Socket;
 require xCAT::DSHCLI;
+require xCAT::NetworkUtils;
 1;
 
 #-------------------------------------------------------