diff --git a/reactos/tools/unicode/cptable.c b/reactos/tools/unicode/cptable.c
index 7e45f15e03d..dd66d2f412e 100644
--- a/reactos/tools/unicode/cptable.c
+++ b/reactos/tools/unicode/cptable.c
@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include <windef.h>
 #include <stdlib.h>
 
 #include "wine/unicode.h"