May 27, 2016 3:19 PM EDT

Kit Harington got a surprise caller during a BBC radio interview: his onscreen half-sister in Game of Thrones, Maisie Williams.

“Oh, look who it is,” Harington, who plays Jon Snow on the popular series, laughs when Williams identifies herself on the phone. The two then proceed to chat about Harington’s new play Doctor Faustus, Williams’ morning at the gym, and to make weekend plans.

“I actually do have a question,” Williams says. “When are we next hanging out, Kit?”

As they hash out which night would be best to “party” after one of Harington’s shows with fellow Game of Thrones actress Sophie Turner, he says, “This just saves me from all the texts.”

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