diff --git a/management/status_checks.py b/management/status_checks.py
index 61bd7d2d..cd92435e 100755
--- a/management/status_checks.py
+++ b/management/status_checks.py
@@ -370,12 +370,9 @@ def check_dns_zone(domain, env, output, dns_zonefiles):
 	# the TLD, and so we're not actually checking the TLD. For that we'd need
 	# to do a DNS trace.
 	ip = query_dns(domain, "A")
-	secondary_ns = get_secondary_dns(get_custom_dns_config(env)) or "ns2." + env['PRIMARY_HOSTNAME']
+	secondary_ns = get_secondary_dns(get_custom_dns_config(env)) or ["ns2." + env['PRIMARY_HOSTNAME']]
 	existing_ns = query_dns(domain, "NS")
-	correct_ns = "; ".join(sorted([
-		"ns1." + env['PRIMARY_HOSTNAME'],
-		secondary_ns,
-		]))
+	correct_ns = "; ".join(sorted(["ns1." + env['PRIMARY_HOSTNAME']] + secondary_ns))
 	if existing_ns.lower() == correct_ns.lower():
 		output.print_ok("Nameservers are set correctly at registrar. [%s]" % correct_ns)
 	elif ip == env['PUBLIC_IP']: