diff --git a/ghost/admin/app/controllers/modals/delete-user.js b/ghost/admin/app/controllers/modals/delete-user.js
index b657e0f17b..38f545048f 100644
--- a/ghost/admin/app/controllers/modals/delete-user.js
+++ b/ghost/admin/app/controllers/modals/delete-user.js
@@ -6,7 +6,7 @@ export default Ember.Controller.extend({
     userPostCount: Ember.computed('model.id', function () {
         var promise,
             query = {
-                author: this.get('model.slug'),
+                filter: `author:${this.get('model.slug')}`,
                 status: 'all'
             };