diff --git a/scripts/mongodb/migrations/2016-04-15-move-deleted-classroom-members.js b/scripts/mongodb/migrations/2016-04-15-move-deleted-classroom-members.js
index ffe35b6e4..7d3086ac5 100644
--- a/scripts/mongodb/migrations/2016-04-15-move-deleted-classroom-members.js
+++ b/scripts/mongodb/migrations/2016-04-15-move-deleted-classroom-members.js
@@ -1,7 +1,11 @@
+load('bower_components/lodash/dist/lodash.js');
 var classrooms = db.classrooms.find();
 classrooms.forEach(function (classroom) {
     print('classroom', classroom._id);
     classroom.members.forEach(function (userID) {
+        if (_.isString(userID)) {
+            userID = ObjectId(userID);
+        }
         var user = db.users.findOne({ _id: userID }, { deleted: true });
         if (user.deleted) {
             print('\tFOUND ONE', userID);