diff --git a/components/fatfs/Kconfig b/components/fatfs/Kconfig
index 62254afa5a..9f44263a0e 100644
--- a/components/fatfs/Kconfig
+++ b/components/fatfs/Kconfig
@@ -180,8 +180,6 @@ menu "FAT Filesystem support"
 
         config FATFS_API_ENCODING_ANSI_OEM
             bool "API uses ANSI/OEM encoding"
-        config FATFS_API_ENCODING_UTF_16
-            bool "API uses UTF-16 encoding"
         config FATFS_API_ENCODING_UTF_8
             bool "API uses UTF-8 encoding"
     endchoice
diff --git a/components/fatfs/src/ffconf.h b/components/fatfs/src/ffconf.h
index a265dee159..1edb2313d8 100644
--- a/components/fatfs/src/ffconf.h
+++ b/components/fatfs/src/ffconf.h
@@ -147,8 +147,6 @@
 
 #ifdef CONFIG_FATFS_API_ENCODING_UTF_8
 #define FF_LFN_UNICODE      2
-#elif defined(CONFIG_FATFS_API_ENCODING_UTF_16)
-#define FF_LFN_UNICODE      1
 #else /* CONFIG_FATFS_API_ENCODING_ANSI_OEM */
 #define FF_LFN_UNICODE      0
 #endif