diff --git a/reactos/include/psdk/windowsx.h b/reactos/include/psdk/windowsx.h
index dc813389899..0ed21e8fe04 100644
--- a/reactos/include/psdk/windowsx.h
+++ b/reactos/include/psdk/windowsx.h
@@ -1,6 +1,7 @@
 #ifndef _WINDOWSX_H
 #define _WINDOWSX_H
 
+#define WM_CTLCOLOR 25
 #define Button_Enable(hwndCtl,fEnable) EnableWindow((hwndCtl),(fEnable))
 #define Button_GetCheck(hwndCtl) ((int)(DWORD)SendMessage((hwndCtl),BM_GETCHECK,0,0))
 #define Button_GetState(hwndCtl) ((int)(DWORD)SendMessage((hwndCtl),BM_GETSTATE,0,0))
diff --git a/reactos/include/reactos/undocuser.h b/reactos/include/reactos/undocuser.h
index 208c10b3686..06312d7d34e 100644
--- a/reactos/include/reactos/undocuser.h
+++ b/reactos/include/reactos/undocuser.h
@@ -25,7 +25,6 @@
 
 /* Non SDK Window Message types. */
 #define WM_SETVISIBLE      0x00000009
-#define WM_CTLCOLOR        0x00000019
 #define WM_ALTTABACTIVE    0x00000029
 #define WM_ISACTIVEICON    0x00000035
 #define WM_QUERYPARKICON   0x00000036