diff --git a/framework/core/js/forum/src/components/PostStream.js b/framework/core/js/forum/src/components/PostStream.js
index 19b70a70c..41f1c8c64 100644
--- a/framework/core/js/forum/src/components/PostStream.js
+++ b/framework/core/js/forum/src/components/PostStream.js
@@ -464,7 +464,7 @@ class PostStream extends Component {
 
       if (top + height > scrollTop) {
         if (!startNumber) {
-          startNumber = $item.data('number');
+          startNumber = endNumber = $item.data('number');
         }
 
         if (top + height < scrollTop + viewportHeight) {