(CNN) A "Game of Thrones" actor is the latest celebrity to say he's been diagnosed with the coronavirus.

In a post made to Instagram on Monday, actor Kristofer Hivju, who played Tormund Giantsbane on the HBO series, said he tested positive for Covid-19.

Hivju, a Norwegian actor, said he and his family are self-isolating upon the news.

"We are in good health - I only have mild symptoms of a cold," he wrote. "There are people at higher risk for who this virus might be a devastating diagnosis, so I urge all of you to be extremely careful; wash your hands, keep 1,5 meters distance from others, go in quarantine; just do everything you can to stop the virus from spreading.

The actor said he is currently in Norway.

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