int nr = 1;
        int newfd;
        struct tree_desc desc[2];
+       struct tree *tree;
        struct unpack_trees_options opts;
        struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
 
                return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
        if (unpack_trees(nr, desc, &opts))
                return -1;
+
+       if (reset_type == MIXED || reset_type == HARD) {
+               tree = parse_tree_indirect(sha1);
+               prime_cache_tree(&active_cache_tree, tree);
+       }
+
        if (write_cache(newfd, active_cache, active_nr) ||
            commit_locked_index(lock))
                return error(_("Could not write new index file."));