diff --git a/lib/util/zmqutil.js b/lib/util/zmqutil.js
index e551ee1d..5802ba6d 100644
--- a/lib/util/zmqutil.js
+++ b/lib/util/zmqutil.js
@@ -11,7 +11,7 @@ var log = require('./logger').createLogger('util:zmqutil')
 module.exports.socket = function() {
   var sock = zmq.socket.apply(zmq, arguments)
 
-  ;['ZMQ_TCP_KEEPALIVE', 'ZMQ_TCP_KEEPALIVE_IDLE'].forEach(function(opt) {
+  ;['ZMQ_TCP_KEEPALIVE', 'ZMQ_TCP_KEEPALIVE_IDLE', 'ZMQ_IPV6'].forEach(function(opt) {
     if (process.env[opt]) {
       try {
         sock.setsockopt(zmq[opt], Number(process.env[opt]))