diff --git a/app/assets/javascripts/discourse/models/post.js.es6 b/app/assets/javascripts/discourse/models/post.js.es6
index 2e3681c5c62..9a9fbe8e635 100644
--- a/app/assets/javascripts/discourse/models/post.js.es6
+++ b/app/assets/javascripts/discourse/models/post.js.es6
@@ -11,11 +11,17 @@ import { userPath } from "discourse/lib/url";
 import Composer from "discourse/models/composer";
 
 const Post = RestModel.extend({
-  @computed()
-  siteSettings() {
-    // TODO: Remove this once one instantiate all `Discourse.Post` models via the store.
-    return Discourse.SiteSettings;
-  },
+  // TODO: Remove this once one instantiate all `Discourse.Post` models via the store.
+  siteSettings: Ember.computed({
+    get() {
+      return Discourse.SiteSettings;
+    },
+
+    // prevents model created from json to overridde this property
+    set() {
+      return Discourse.SiteSettings;
+    }
+  }),
 
   @computed("url")
   shareUrl(url) {