diff --git a/user/fs/fmt.c b/user/fs/fmt.c
index 7708e1b..6465123 100644
--- a/user/fs/fmt.c
+++ b/user/fs/fmt.c
@@ -32,5 +32,5 @@ void fs_fmt(void) {
     return;
   }
 
-  /* vfsunmount("fmt-dummy"); */
+  vfsunmount("fmt-dummy");
 }