diff --git a/migrations/20130129_add_missing_preferences.js b/migrations/20130129_add_missing_preferences.js
index 745a365bd0..f4e7b55762 100644
--- a/migrations/20130129_add_missing_preferences.js
+++ b/migrations/20130129_add_missing_preferences.js
@@ -1,5 +1,5 @@
 db.users.update(
-    {'preferences':{$exists:false}},
+    {preferences:{$exists:false}},
     {$set:{preferences:{gender: 'm', armorSet: 'v1'}}},
     {multi:true}
 )