diff --git a/source/fs/mufs/super.c b/source/fs/mufs/super.c
index c93b5bb..7b96d40 100644
--- a/source/fs/mufs/super.c
+++ b/source/fs/mufs/super.c
@@ -88,5 +88,5 @@ int mufs_format(struct flash_dev *dev)
 	if (flash_write(dev, 0, &super, sizeof super) == 0)
 		return -1;
 
-	return 0;
+	return flash_sync(dev);
 }