diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 32ed362c1f8..157b921fc48 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -53,6 +53,7 @@ class MouseEvent;
 class Node;
 class ParentNode;
 class Position;
+class ShadowRoot;
 class Text;
 class Timer;
 class Window;