diff --git a/reactos/include/psdk/winuser.h b/reactos/include/psdk/winuser.h
index 7e877ce0a42..90cb6e34e13 100644
--- a/reactos/include/psdk/winuser.h
+++ b/reactos/include/psdk/winuser.h
@@ -2179,6 +2179,14 @@ extern "C" {
 #define VK_NONAME	0xFC
 #define VK_PA1	0xFD
 #define VK_OEM_CLEAR	0xFE
+
+/* MapVirtualKey translation types */
+#define MAPVK_VK_TO_VSC     0
+#define MAPVK_VSC_TO_VK     1
+#define MAPVK_VK_TO_CHAR    2
+#define MAPVK_VSC_TO_VK_EX  3
+#define MAPVK_VK_TO_VSC_EX  4
+
 #define TME_HOVER	1
 #define TME_LEAVE	2
 #define TME_NONCLIENT   0x00000010