diff --git a/reactos/sdk/include/psdk/winuser.h b/reactos/sdk/include/psdk/winuser.h
index dbeee38c666..4a7752253dc 100644
--- a/reactos/sdk/include/psdk/winuser.h
+++ b/reactos/sdk/include/psdk/winuser.h
@@ -116,7 +116,7 @@ extern "C" {
 #define KLF_NOTELLSHELL	128
 #define KLF_SETFORPROCESS	256
 #if (_WIN32_WINNT >= 0x0500)
-#define KLF_SHIFTLOCK  65535
+#define KLF_SHIFTLOCK  0x00010000
 #define KLF_RESET 0x40000000
 #endif  /*(_WIN32_WINNT >= 0x0500) */
 #define KL_NAMELENGTH 9