diff --git a/reactos/w32api/include/winuser.h b/reactos/w32api/include/winuser.h
index 7cb272f891a..7246baf3869 100644
--- a/reactos/w32api/include/winuser.h
+++ b/reactos/w32api/include/winuser.h
@@ -1441,6 +1441,8 @@ extern "C" {
 #define WM_NCXBUTTONDBLCLK 173
 #endif
 #define WM_NCMOUSEMOVE 160
+#define WM_NCMOUSEHOVER     0x02A0
+#define WM_NCMOUSELEAVE     0x02A2
 #define WM_NCPAINT 133
 #define WM_NCRBUTTONDBLCLK 166
 #define WM_NCRBUTTONDOWN 164
@@ -1954,6 +1956,7 @@ extern "C" {
 #define VK_OEM_CLEAR	0xFE
 #define TME_HOVER	1
 #define TME_LEAVE	2
+#define TME_NONCLIENT   0x00000010
 #define TME_QUERY	0x40000000
 #define TME_CANCEL	0x80000000
 #define HOVER_DEFAULT	0xFFFFFFFF