diff --git a/include/Interface/VGUI/ISurface2.h b/include/Interface/VGUI/ISurface2.h
index 0abdab4d..2d65c0a9 100644
--- a/include/Interface/VGUI/ISurface2.h
+++ b/include/Interface/VGUI/ISurface2.h
@@ -7,6 +7,9 @@
 #include <mathlib/vector2d.h>
 #include <Color.h>
 
+class IHTMLResponses;
+class IHTMLChromeController;
+
 namespace vgui
 {