diff --git a/xCAT/postscripts/xcatdsklspost b/xCAT/postscripts/xcatdsklspost
index 197660af0..639583040 100755
--- a/xCAT/postscripts/xcatdsklspost
+++ b/xCAT/postscripts/xcatdsklspost
@@ -95,7 +95,7 @@ fi
 if [ $# -eq 0 ]; then
   #notify the server that we are done with netbooting
   CNS=`grep NODESTATUS= /tmp/mypostscript |awk -F = '{print $2}'`
-  if [ -z "$CNS" ] || [ $CNS != "'0'" -a   $CNS != "'N'"  -a  $CNS != "'n'" ]; then
+  if [ -z "$CNS" ] || [ "$CNS" != "'0'" -a   "$CNS" != "'N'"  -a  "$CNS" != "'n'" ]; then
       echo "updateflag.awk \$MASTER 3002 \"installstatus booted\"" >> /tmp/mypostscript
   fi
 fi