The verb 'help' takes to-infinitives and bare infinitives but bare infinitives are said to be the most common in casual text; as also used in this example sentence.
不定詞の形容詞的用法には2種類あり、①限定用法、②叙述用法。②はもちろん主格補語です。
There are two ways of using the infinitive as an adjective, 1. attributive, 2. predicative. Naturally 2. is a subject complement.