diff --git a/lib/dns.js b/lib/dns.js
index e1a2c03385..bbbcec13ff 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -330,7 +330,6 @@ exports.NOTFOUND = 'ENOTFOUND';
 exports.NOTIMP = 'ENOTIMP';
 exports.REFUSED = 'EREFUSED';
 exports.BADQUERY = 'EBADQUERY';
-exports.ADNAME = 'EADNAME';
 exports.BADNAME = 'EBADNAME';
 exports.BADFAMILY = 'EBADFAMILY';
 exports.BADRESP = 'EBADRESP';