diff --git a/js/src/forum/components/DiscussionPage.js b/js/src/forum/components/DiscussionPage.js
index 298f70d62..b168a68a0 100644
--- a/js/src/forum/components/DiscussionPage.js
+++ b/js/src/forum/components/DiscussionPage.js
@@ -223,7 +223,6 @@ export default class DiscussionPage extends Page {
     items.add(
       'scrubber',
       PostStreamScrubber.component({
-        discussion: this.discussion,
         stream: this.stream,
         className: 'App-titleControl',
       }),
diff --git a/js/src/forum/components/PostStreamScrubber.js b/js/src/forum/components/PostStreamScrubber.js
index 3956e24b9..deb4cf2cf 100644
--- a/js/src/forum/components/PostStreamScrubber.js
+++ b/js/src/forum/components/PostStreamScrubber.js
@@ -31,7 +31,7 @@ export default class PostStreamScrubber extends Component {
       count: <span className="Scrubber-count">{formatNumber(count)}</span>,
     });
 
-    const unreadCount = this.attrs.discussion.unreadCount();
+    const unreadCount = this.stream.discussion.unreadCount();
     const unreadPercent = count ? Math.min(count - this.stream.index, unreadCount) / count : 0;
 
     function styleUnread(vnode) {