diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 7c14e9fa8d..3954b2dcfe 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -27,6 +27,7 @@ class Selector;
 class StyleProperties;
 class StyleResolver;
 class StyleSheet;
+class StyleValue;
 enum class Display;
 }