As the mistake was done via the god Indra, he grants Hanuman a wish that his physique could be as strong as Indra's Vajra, and that his Vajra may also not hurt him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://hindutemplesouthaustralia.business.blog/2024/06/14/discover-the-essence-of-hinduism-at-the-hanuman-mandir/