1 files changed, 3 insertions, 2 deletions
diff --git a/node_modules/mongodb/lib/collection.js b/node_modules/mongodb/lib/collection.js
index b2bbf2b..bbe1e3b 100644
--- a/node_modules/mongodb/lib/collection.js
+++ b/node_modules/mongodb/lib/collection.js
@@ -20,7 +20,8 @@ var checkCollectionName = require('./utils').checkCollectionName
   , Define = require('./metadata')
   , Cursor = require('./cursor')
   , unordered = require('./bulk/unordered')
-  , ordered = require('./bulk/ordered');
+  , ordered = require('./bulk/ordered')
+  , assign = require('./utils').assign;
 
 /**
  * @fileOverview The **Collection** class is an internal class that embodies a MongoDB collection
@@ -1386,7 +1387,7 @@ define.classMethod('findOne', {callback: true, promise:true});
 Collection.prototype.rename = function(newName, opt, callback) {
   var self = this;
   if(typeof opt == 'function') callback = opt, opt = {};
-  opt = Object.assign({}, opt, {readPreference: ReadPreference.PRIMARY});
+  opt = assign({}, opt, {readPreference: ReadPreference.PRIMARY});
 
   // Execute using callback
   if(typeof callback == 'function') return rename(self, newName, opt, callback);