diff --git a/website/server/models/userNotification.js b/website/server/models/userNotification.js
index be642d1222..27d29eeb9c 100644
--- a/website/server/models/userNotification.js
+++ b/website/server/models/userNotification.js
@@ -35,6 +35,7 @@ const NOTIFICATION_TYPES = [
   'ACHIEVEMENT_ALL_YOUR_BASE',
   'ACHIEVEMENT_BACK_TO_BASICS',
   'ACHIEVEMENT_JUST_ADD_WATER',
+  'ACHIEVEMENT_LOST_MASTERCLASSER',
   'ACHIEVEMENT_MIND_OVER_MATTER',
 ];