diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index a4768318f0..b19e9c96a6 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -254,6 +254,7 @@ class LineBox;
 class LineBoxFragment;
 class Node;
 class NodeWithStyle;
+class NodeWithStyleAndBoxModelMetrics;
 class RadioButton;
 class ReplacedBox;
 class TextNode;