diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 8dc33fe717..f905f2cfb8 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -159,6 +159,7 @@ class RatioStyleValue;
 class RectStyleValue;
 class Resolution;
 class ResolutionStyleValue;
+class RevertStyleValue;
 class Screen;
 class Selector;
 class ShadowStyleValue;