diff --git a/reactos/dll/win32/msacm32/wineacm.h b/reactos/dll/win32/msacm32/wineacm.h
index 16b6c41f365..11dea6e05b7 100644
--- a/reactos/dll/win32/msacm32/wineacm.h
+++ b/reactos/dll/win32/msacm32/wineacm.h
@@ -20,19 +20,20 @@
 #ifndef __WINE_WINEACM_H
 #define __WINE_WINEACM_H
 
-#include <config.h>
+#include <wine/config.h>
 
 #include <stdarg.h>
 
 #define WIN32_NO_STATUS
 #define NOBITMAP
 
-#include <wine/msacmdrv.h>
-#include <wine/unicode.h>
-
+#include <windef.h>
 #include <winuser.h>
 
 #include <wine/debug.h>
+#include <wine/msacmdrv.h>
+#include <wine/unicode.h>
+
 WINE_DEFAULT_DEBUG_CHANNEL(msacm);
 
 /***********************************************************************