diff --git a/app/assets/javascripts/discourse-loader.js b/app/assets/javascripts/discourse-loader.js
index cde52ac72ce..e73ecd2b7b3 100644
--- a/app/assets/javascripts/discourse-loader.js
+++ b/app/assets/javascripts/discourse-loader.js
@@ -77,6 +77,7 @@ var define, requirejs;
       },
       "@ember/object/mixin": { default: Ember.Mixin },
       "@ember/object/proxy": { default: Ember.ObjectProxy },
+      "@ember/object/promise-proxy-mixin": { default: Ember.PromiseProxyMixin },
       "@ember/object/evented": {
         default: Ember.Evented,
         on: Ember.on