diff --git a/assets/javascripts/discourse/connectors/user-messages-nav/assigned-messages.js.es6 b/assets/javascripts/discourse/connectors/user-messages-nav/assigned-messages.js.es6
index eb7b5fc..ddcd421 100644
--- a/assets/javascripts/discourse/connectors/user-messages-nav/assigned-messages.js.es6
+++ b/assets/javascripts/discourse/connectors/user-messages-nav/assigned-messages.js.es6
@@ -1,7 +1,6 @@
 export default {
   shouldRender(args, component) {
     const needsButton = component.currentUser && component.currentUser.get('staff');
-    return needsButton && (!component.get('site.mobileView') || args.topic.get('isPrivateMessage'));
+    return needsButton && (!component.get('site.mobileView') || args.model.get('isPrivateMessage'));
   }
 };
-