diff --git a/frontend/js/feed.js b/frontend/js/feed.js
index 84f7876..3d2cf8b 100644
--- a/frontend/js/feed.js
+++ b/frontend/js/feed.js
@@ -744,7 +744,7 @@ App.feed = App.feed || {};
                 <div class="cp-format-menu feed-format-menu" role="menu" hidden></div>
                 <div class="feed-pane-tools">
                     <button class="feed-pane-btn feed-pane-mute" type="button" aria-label="Mute this panel"></button>
-                    <button class="feed-pane-btn feed-pane-split-right" type="button" title="Add a panel to the right" aria-label="Add a panel to the right">⊞</button>
+                    <button class="feed-pane-btn feed-pane-split-right" type="button" title="Add a panel to the right" aria-label="Add a panel to the right">◫</button>
                     <button class="feed-pane-btn feed-pane-split-down" type="button" title="Add a panel below" aria-label="Add a panel below">⊟</button>
                     <button class="feed-pane-btn feed-pane-close" type="button" title="Close this panel" aria-label="Close this panel" hidden>✕</button>
                 </div>