diff --git a/lib/oofatfs/ffconf.h b/lib/oofatfs/ffconf.h
index 4a8015668..6287f7d98 100644
--- a/lib/oofatfs/ffconf.h
+++ b/lib/oofatfs/ffconf.h
@@ -164,7 +164,7 @@
 /  ff_memfree() in ffsystem.c, need to be added to the project. */
 
 
-#define FF_LFN_UNICODE  0
+#define FF_LFN_UNICODE  2
 /* This option switches the character encoding on the API when LFN is enabled.
 /
 /   0: ANSI/OEM in current CP (TCHAR = char)