diff --git a/fs/fat/fs_fat32.c b/fs/fat/fs_fat32.c
index 0f4bbe8940f..700e09230c9 100644
--- a/fs/fat/fs_fat32.c
+++ b/fs/fat/fs_fat32.c
@@ -1316,7 +1316,7 @@ static int fat_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
   /* ioctl calls are just passed through to the contained block driver */
 
   nxmutex_unlock(&fs->fs_lock);
-  return -ENOSYS;
+  return -ENOTTY;
 }
 
 /****************************************************************************