diff --git a/migrations/20140803_remove_undefined_notifications.js b/migrations/20140803_remove_undefined_notifications.js
new file mode 100644
index 0000000000..fe0d143a56
--- /dev/null
+++ b/migrations/20140803_remove_undefined_notifications.js
@@ -0,0 +1,13 @@
+var _ = require('lodash');
+
+db.users.find({}).forEach(function(user){
+  var newNewMessages = {};
+
+  _.each(user.newMessages, function(val, key){
+    if(key != "undefined"){
+      newNewMessages[key] = val;
+    };
+  });
+
+  db.users.update({_id: user._id}, {$set: {'newMessages': newNewMessages}});
+});