diff --git a/lib/oofatfs/ffconf.h b/lib/oofatfs/ffconf.h
index 4f37bb9cad..71dfaabcb9 100644
--- a/lib/oofatfs/ffconf.h
+++ b/lib/oofatfs/ffconf.h
@@ -268,7 +268,11 @@
 /  buffer in the file system object (FATFS) is used for the file data transfer. */
 
 
+#ifdef MICROPY_FATFS_EXFAT
+#define _FS_EXFAT   (MICROPY_FATFS_EXFAT)
+#else
 #define _FS_EXFAT   0
+#endif
 /* This option switches support of exFAT file system. (0:Disable or 1:Enable)
 /  When enable exFAT, also LFN needs to be enabled. (_USE_LFN >= 1)
 /  Note that enabling exFAT discards C89 compatibility. */