diff --git a/lib/connectors/sentinel_connector.js b/lib/connectors/sentinel_connector.js
index a4bb5af9..30b168e0 100644
--- a/lib/connectors/sentinel_connector.js
+++ b/lib/connectors/sentinel_connector.js
@@ -99,10 +99,8 @@ SentinelConnector.prototype.updateSentinels = function (client, callback) {
         var sentinel = utils.packObject(result[i]);
         var flags = sentinel.flags ? sentinel.flags.split(',') : [];
         if (flags.indexOf('disconnected') === -1 && sentinel.ip && sentinel.port) {
-          var endpoint = { host: sentinel.ip, port: parseInt(sentinel.port) };
-          var isDuplicate = _this.sentinels.some(function (o) {
-            return o.host === endpoint.host && o.port === endpoint.port;
-          });
+          var endpoint = { host: sentinel.ip, port: parseInt(sentinel.port, 10) };
+          var isDuplicate = _this.sentinels.some(_.bind(isSentinelEql, null, endpoint));
           if (!isDuplicate) {
             debug('adding sentinel %s:%s', endpoint.host, endpoint.port);
             _this.sentinels.push(endpoint);
@@ -178,4 +176,9 @@ SentinelConnector.prototype.resolve = function (endpoint, callback) {
 
 function noop() {}
 
+function isSentinelEql(a, b) {
+  return ((a.host || '127.0.0.1') === (b.host || '127.0.0.1')) &&
+    ((a.port || 6379) === (b.port || 6379));
+}
+
 module.exports = SentinelConnector;