diff --git a/fs/namespace.c b/fs/namespace.c
index 43b16af8af30..15d0328bd035 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3011,6 +3011,7 @@ static void __init init_mount_tree(void)
 
 	root.mnt = mnt;
 	root.dentry = mnt->mnt_root;
+	mnt->mnt_flags |= MNT_LOCKED;
 
 	set_fs_pwd(current->fs, &root);
 	set_fs_root(current->fs, &root);