diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 8b95b9f338..17b67200b0 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -508,6 +508,7 @@ class ButtonBox;
 class CheckBox;
 class FlexFormattingContext;
 class FormattingContext;
+class ImageBox;
 class InlineFormattingContext;
 class Label;
 class LabelableNode;