diff --git a/reactos/include/win32k/ntuser.h b/reactos/include/win32k/ntuser.h
index 03e219e8475..5343246f63a 100644
--- a/reactos/include/win32k/ntuser.h
+++ b/reactos/include/win32k/ntuser.h
@@ -1,7 +1,6 @@
 #ifndef __WIN32K_NTUSER_H
 #define __WIN32K_NTUSER_H
 
-#define WM_SYSTIMER 280
 
 ULONG STDCALL
 NtUserGetSystemMetrics(ULONG Index);
diff --git a/reactos/w32api/include/winuser.h b/reactos/w32api/include/winuser.h
index 686d2ff503a..0c3f4c2ffc4 100644
--- a/reactos/w32api/include/winuser.h
+++ b/reactos/w32api/include/winuser.h
@@ -1497,6 +1497,7 @@ extern "C" {
 #define WM_TCARD 82
 #define WM_TIMECHANGE 30
 #define WM_TIMER 275
+#define WM_SYSTIMER 280
 #define WM_UNDO 772
 #define WM_USER 1024
 #define WM_USERCHANGED 84