diff --git a/migrations/preen_cron.js b/migrations/preen_cron.js
index fea1ef5e4f..4d141d3ed6 100644
--- a/migrations/preen_cron.js
+++ b/migrations/preen_cron.js
@@ -36,7 +36,7 @@ db.users.find({
 /**
  * Remove empty parties
  */
-db.users.groups.remove({
+db.groups.remove({
     $where: function(){ return this.type === 'party' && this.members.length === 0; }
 });