diff --git a/app/javascript/mastodon/components/dropdown_menu.jsx b/app/javascript/mastodon/components/dropdown_menu.jsx
index 524dbb927b..49951cfb5f 100644
--- a/app/javascript/mastodon/components/dropdown_menu.jsx
+++ b/app/javascript/mastodon/components/dropdown_menu.jsx
@@ -39,6 +39,7 @@ class DropdownMenu extends PureComponent {
     if (this.node && !this.node.contains(e.target)) {
       this.props.onClose();
       e.stopPropagation();
+      e.preventDefault();
     }
   };