Thinking in the future, you can add a custom zone template adding A registers for NS1 and NS1 as follows:
; Generated by CWP
; Zone file for DOMAIN_REPLACE
$TTL 14400
DOMAIN_REPLACE.      86400        IN      SOA     NS1_REPLACE. DNS_EMAIL. (
            2013071600      ; serial, todays date+todays
            86400           ; refresh, seconds
            7200            ; retry, seconds
            3600000         ; expire, seconds
            86400 )         ; minimum, seconds
DOMAIN_REPLACE. 86400 IN NS NS1_REPLACE.
DOMAIN_REPLACE. 86400 IN NS NS2_REPLACE.
NS1.DOMAIN_REPLACE IN A IP_REPLACE
NS2.DOMAIN_REPLACE IN A IP_REPLACE
DOMAIN_REPLACE. IN A IP_REPLACE
localhost.DOMAIN_REPLACE. IN A 127.0.0.1
DOMAIN_REPLACE. IN MX 0 DOMAIN_REPLACE.
mail IN CNAME DOMAIN_REPLACE.
www IN CNAME DOMAIN_REPLACE.
ftp IN CNAME DOMAIN_REPLACE.
; Add additional settings below this line
-- 
Bests
Renix