diff --git a/fs/namespace.c b/fs/namespace.c
index 5b66b2b..144f41f 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1369,6 +1369,8 @@ void umount_tree(struct mount *mnt, int how)
 	}
 	if (last) {
 		last->mnt_hash.next = unmounted.first;
+		if (unmounted.first)
+			unmounted.first->pprev = &last->mnt_hash.next;
 		unmounted.first = tmp_list.first;
 		unmounted.first->pprev = &unmounted.first;
 	}