self->scale = newtScale(0, 0, cols, total);
                if (self->scale == NULL)
                        goto out_free_form;
-               newtFormAddComponents(self->form, self->scale, NULL);
+               newtFormAddComponent(self->form, self->scale);
                newtRefresh();
        }
 
        if (listbox == NULL)
                goto out_destroy_form;
 
-       newtFormAddComponents(form, listbox, NULL);
+       newtFormAddComponent(form, listbox);
 
        for (i = 0; i < argc; ++i) {
                int len = strlen(argv[i]);
 
        newtCenteredWindow(max_line_len + 2, rows - 5, self->sym->name);
        form = newt_form__new();
-       newtFormAddComponents(form, tree, NULL);
+       newtFormAddComponent(form, tree);
 
        newtFormRun(form, &es);
        newtFormDestroy(form);