diff --git a/certbot-dns-rfc2136/certbot_dns_rfc2136/dns_rfc2136.py b/certbot-dns-rfc2136/certbot_dns_rfc2136/dns_rfc2136.py
index b4b71bb75..85a3bf9bb 100644
--- a/certbot-dns-rfc2136/certbot_dns_rfc2136/dns_rfc2136.py
+++ b/certbot-dns-rfc2136/certbot_dns_rfc2136/dns_rfc2136.py
@@ -208,8 +208,8 @@ class _RFC2136Client(object):
             rcode = response.rcode()
 
             # Authoritative Answer bit should be set
-            if (rcode == dns.rcode.NOERROR and len(response.answer) > 0 and
-                    response.flags & dns.flags.AA):
+            if (rcode == dns.rcode.NOERROR and response.get_rrset(response.answer,
+                domain, dns.rdataclass.IN, dns.rdatatype.SOA) and response.flags & dns.flags.AA):
                 logger.debug('Received authoritative SOA response for %s', domain_name)
                 return True