diff --git a/xCAT-client/bin/updatenode b/xCAT-client/bin/updatenode
index d4c2504c0..7223747d3 100755
--- a/xCAT-client/bin/updatenode
+++ b/xCAT-client/bin/updatenode
@@ -89,6 +89,7 @@ if (
                 's|sn'             => \$::SETSERVER,
                 'P|scripts:s'      => \$::RERUNPS,
                 'k|security'       => \$::SECURITY,
+                'o|os:s'      	   => \$::OS,
                 'user=s'           => \$::USER,
                 'devicetype=s'     => \$::DEVICETYPE,
     )