diff --git a/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7 b/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
index 9bdb9552d..7c0a6179d 100755
--- a/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
+++ b/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
@@ -183,7 +183,7 @@ if [ -d /sys/firmware/efi ]; then
 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...
-echo "part /boot --size 256 --fstype $BOOTFSTYPE --ondisk $instdisk" >> /tmp/partitionfile
+echo "part /boot --size 512 --fstype $BOOTFSTYPE --ondisk $instdisk" >> /tmp/partitionfile
 echo "part swap --recommended --ondisk $instdisk" >> /tmp/partitionfile
 echo "part pv.01 --size 1 --grow --ondisk $instdisk" >> /tmp/partitionfile
 echo "volgroup system pv.01" >> /tmp/partitionfile