diff --git a/xCAT-server/sbin/lpar_netboot.expect b/xCAT-server/sbin/lpar_netboot.expect
index 13b21349e..5a87f9fe6 100644
--- a/xCAT-server/sbin/lpar_netboot.expect
+++ b/xCAT-server/sbin/lpar_netboot.expect
@@ -98,7 +98,7 @@ proc run_lssyscfg {} {
     set rc [catch $runcmd msg] 
     nc_msg "$PROGRAM Status: run_lssyscg : partition status : $msg\n"
     regexp "$node:\[ ]*(.*)" $msg tmp1 tmp
-    if { $tmp } {
+    if { $tmp != "" } {
         set msg $tmp
     }
     nc_msg "####msg:$msg#########\n"