diff --git a/lib/mongo/Mutator.js b/lib/mongo/Mutator.js
index d6bb31d..b3f6e81 100644
--- a/lib/mongo/Mutator.js
+++ b/lib/mongo/Mutator.js
@@ -9,6 +9,7 @@ import {
 } from "./lib/dispatchers";
 import Config from "../config";
 import { Events } from "../constants";
+import { Mongo } from 'meteor/mongo';
 
 function runCallbackInBackground(fn) {
   Meteor.defer(Meteor.bindEnvironment(fn));
@@ -107,7 +108,7 @@ export default class Mutator {
    * @returns {*}
    */
   static async update(Originals, selector, modifier, _config, callback) {
-    if (_.isString(selector)) {
+    if (_.isString(selector) || selector instanceof Mongo.ObjectID) {
       selector = { _id: selector };
     }