July 28, 2014 1:34 AM EDT

Arya Stark’s covert wandering in HBO’s Game of Thrones may be rubbing off on 17-year-old actress Maisie Williams, who took to the floors of this year’s Comic-Con convention in San Diego while wearing a Spider-Man mask in order to go unnoticed.

Williams posted an Instagram picture of her incognito stroll on Sunday.

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