diff --git a/app/assets/javascripts/discourse/controllers/user_activity_controller.js b/app/assets/javascripts/discourse/controllers/user_activity_controller.js
index 27a53d1eb..ecc15ca48 100644
--- a/app/assets/javascripts/discourse/controllers/user_activity_controller.js
+++ b/app/assets/javascripts/discourse/controllers/user_activity_controller.js
@@ -18,11 +18,9 @@ Discourse.UserActivityController = Discourse.ObjectController.extend({
   composePrivateMessage: function() {
     return this.get('controllers.composer').open({
       action: Discourse.Composer.PRIVATE_MESSAGE,
-      usernames: this.get('content').username,
+      usernames: this.get('content.user.username'),
       archetypeId: 'private_message',
       draftKey: 'new_private_message'
     });
   }
 });
-
-