diff --git a/reactos/drivers/filesystems/vfat/fcb.c b/reactos/drivers/filesystems/vfat/fcb.c
index be3560566bc..20a40bb2b0a 100644
--- a/reactos/drivers/filesystems/vfat/fcb.c
+++ b/reactos/drivers/filesystems/vfat/fcb.c
@@ -10,7 +10,9 @@
 
 /*  -------------------------------------------------------  INCLUDES  */
 
+#ifdef __GNUC__
 #include <wctype.h> /* towlower prototype */
+#endif
 
 #define NDEBUG
 #include "vfat.h"