diff --git a/reactos/include/defines.h b/reactos/include/defines.h
index f7afb23bab0..364b76216b0 100644
--- a/reactos/include/defines.h
+++ b/reactos/include/defines.h
@@ -4192,23 +4192,24 @@ extern "C" {
 #define HTBOTTOMRIGHT	(17)
 #define HTCAPTION	(2)
 #define HTCLIENT	(1)
-#define HTERROR	(-2)
+#define HTERROR		(-2)
 #define HTGROWBOX	(4)
 #define HTHSCROLL	(6)
-#define HTLEFT	(10)
-#define HTMENU	(5)
+#define HTLEFT		(10)
+#define HTMENU		(5)
 #define HTNOWHERE	(0)
 #define HTREDUCE	(8)
-#define HTRIGHT	(11)
-#define HTSIZE	(4)
+#define HTRIGHT		(11)
+#define HTSIZE		(4)
 #define HTSYSMENU	(3)
-#define HTTOP	(12)
+#define HTTOP		(12)
 #define HTTOPLEFT	(13)
 #define HTTOPRIGHT	(14)
 #define HTTRANSPARENT	(-1)
 #define HTVSCROLL	(7)
-#define HTZOOM	(9)
-#define HTBORDER (18)
+#define HTZOOM		(9)
+#define HTBORDER	(18)
+#define HTCLOSE		(20)
 #define HTMAXBUTTON HTZOOM
 #define HTMINBUTTON HTREDUCE