diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 17088b987c..1a7c2e43e6 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -22,11 +22,13 @@ class CalculatedStyleValue;
 class CSSImportRule;
 class CSSMediaRule;
 class CSSRule;
+class CSSRuleList;
 class CSSStyleDeclaration;
 class CSSStyleRule;
 class CSSStyleSheet;
 class ElementInlineCSSStyleDeclaration;
 class Length;
+class MediaList;
 class MediaQuery;
 class MediaQueryList;
 class PropertyOwningCSSStyleDeclaration;