diff --git a/lib/mongo_client.js b/lib/mongo_client.js
index d11d1b97634..f2e132369c5 100644
--- a/lib/mongo_client.js
+++ b/lib/mongo_client.js
@@ -242,7 +242,7 @@ var connect = function(url, options, callback) {
 
     var connectFunction = function(__server) {
       // Attempt connect
-      new Db(object.dbName, __server, {w:1, native_parser:false}).open(function(err, db) {
+      new Db(object.dbName, __server, {w:1, native_parser:false, promiseLibrary:options.promiseLibrary}).open(function(err, db) {
         // Update number of servers
         totalNumberOfServers = totalNumberOfServers - 1;