diff --git a/scripts/util/prepare_linmin.sh b/scripts/util/prepare_linmin.sh
index 6534aa8d2f1..34a9a68ac00 100644
--- a/scripts/util/prepare_linmin.sh
+++ b/scripts/util/prepare_linmin.sh
@@ -8,7 +8,7 @@ err_exit() {
 
 [ ! -f $DHCP_CONF ] && err_exit "Cannot find $DHCP_CONF"
 
-cat $DHCP_CONF | tr '\n' '~' > /tmp/dhcpd.tmp && sed -i 's/\(subnet.*netmask.*{\).*\(~}\)/\1\2/g' /tmp/dhcpd.tmp && cat /tmp/dhcpd.tmp | tr '~' '\n' > $DHCP_CONF && rm /tmp/dhcpd.tmp -f
+cat $DHCP_CONF | tr '\n' '~' > /tmp/dhcpd.tmp && sed -i 's/}/}\n/g' /tmp/dhcpd.tmp && sed -i 's/\(subnet.*netmask.*{\).*\(}\)/\1\2/g' /tmp/dhcpd.tmp && cat /tmp/dhcpd.tmp | tr '~' '\n' > $DHCP_CONF && rm /tmp/dhcpd.tmp -f
 [ $? -ne 0 ] && err_exit "Configure dhcpd.conf failed"
 service dhcpd restart
 [ $? -ne 0 ] && err_exit "restart dhcpd failed"