diff --git a/xCAT-server/share/xcat/install/scripts/pre.rh b/xCAT-server/share/xcat/install/scripts/pre.rh
index 51c32596f..d9ef63c57 100644
--- a/xCAT-server/share/xcat/install/scripts/pre.rh
+++ b/xCAT-server/share/xcat/install/scripts/pre.rh
@@ -179,10 +179,10 @@ else
 	FSTYPE=ext3
 fi
 if [ `uname -m` = "ppc64" ]; then
-	echo 'part None --fstype "PPC PReP Boot" --ondisk $instdisk --size 8' >> /tmp/partitioning 
+	echo 'part None --fstype "PPC PReP Boot" --ondisk '$instdisk' --size 8' >> /tmp/partitioning 
 fi
 if [ -d /sys/firmware/efi ]; then 
-	echo 'part /boot/efi --size 50 --ondisk $instdisk --fstype vfat' >> /tmp/partitioning
+	echo 'part /boot/efi --size 50 --ondisk '$instdisk' --fstype vfat' >> /tmp/partitioning
 fi
 
 #TODO: ondisk detection, /dev/disk/by-id/edd-int13_dev80 for legacy maybe, and no idea about efi.  at least maybe blacklist SAN if mptsas/mpt2sas/megaraid_sas seen...