diff --git a/js/src/forum/compat.js b/js/src/forum/compat.js
index 7e4eae96d..d5135bf93 100644
--- a/js/src/forum/compat.js
+++ b/js/src/forum/compat.js
@@ -14,6 +14,7 @@ import GlobalSearchState from './states/GlobalSearchState';
 import NotificationListState from './states/NotificationListState';
 import PostStreamState from './states/PostStreamState';
 import SearchState from './states/SearchState';
+import AffixedSidebar from './components/AffixedSidebar';
 import DiscussionPage from './components/DiscussionPage';
 import LogInModal from './components/LogInModal';
 import ComposerBody from './components/ComposerBody';
@@ -87,6 +88,7 @@ export default Object.assign(compat, {
   'states/NotificationListState': NotificationListState,
   'states/PostStreamState': PostStreamState,
   'states/SearchState': SearchState,
+  'components/AffixedSidebar': AffixedSidebar,
   'components/DiscussionPage': DiscussionPage,
   'components/LogInModal': LogInModal,
   'components/ComposerBody': ComposerBody,