diff --git a/migrations/20150131_birthday_goodies_fix_remove_robe.js b/migrations/20150131_birthday_goodies_fix_remove_robe.js
new file mode 100644
index 0000000000..e6b688d0ca
--- /dev/null
+++ b/migrations/20150131_birthday_goodies_fix_remove_robe.js
@@ -0,0 +1,61 @@
+var migrationName = '20150131_birthday_goodies_fix_remove_robe.js';
+var authorName = 'Alys'; // in case script author needs to know when their ...
+var authorUuid = 'd904bd62-da08-416b-a816-ba797c9ee265'; //... own data is done
+
+/**
+ * https://github.com/HabitRPG/habitrpg/pull/4374#issuecomment-71038795
+ * Convert false to null for mounts that used to be owned.
+ */
+
+var dbserver = 'localhost:27017' // CHANGE THIS FOR PRODUCTION DATABASE
+
+var mongo = require('mongoskin');
+var _ = require('lodash');
+
+var dbUsers = mongo.db(dbserver + '/habitrpg?auto_reconnect').collection('users');
+
+var query = {
+	'achievements.habitBirthday':{$exists:false}
+	};
+
+var fields = {
+	'items.gear.owned.armor_special_birthday2015':1
+    };
+
+console.warn('Updating users...');
+var progressCount = 1000;
+var count = 0;
+dbUsers.findEach(query, fields, {batchSize:250}, function(err, user) {
+    if (err) { return exiting(1, 'ERROR! ' + err); }
+    if (!user) {
+        console.warn('All appropriate users found and modified.');
+        return displayData();
+    }
+    count++;
+
+    var unset = {'items.gear.owned.armor_special_birthday2015': 1};
+    var set = {'migration': migrationName};
+    // var inc = {'xyz':1, _v:1};
+    dbUsers.update({_id:user._id}, {$unset:unset, $set:set}); // , $inc:inc});
+
+    if (count%progressCount == 0) console.warn(count + ' ' + user._id);
+    if (user._id == authorUuid) console.warn(authorName + ' processed');
+    if (user._id == '9'       ) console.warn('lefnire'  + ' processed');
+});
+
+
+function displayData() {
+    console.warn('\n' + count + ' users processed\n');
+    return exiting(0);
+}
+
+
+function exiting(code, msg) {
+    code = code || 0; // 0 = success
+    if (code && !msg) { msg = 'ERROR!'; }
+    if (msg) {
+        if (code) { console.error(msg); }
+        else      { console.log(  msg); }
+    }
+    process.exit(code);
+}