Did you finish the latest season of Netflix’s Stranger Things and are impatient to see what happens next? You might have to wait a bit longer than expected: in a new interview with Variety, David Harbour says that the next season might not premiere on the streaming service until 2019.

Netflix has already ordered a third season for the show, but Ross and Matt Duffer are still working on the season’s scripts, according to Harbour and he adds that they likely won’t begin filming until April. “Like any good thing,” he says, “[Ross and Matt] need time. And those guys work so hard. I mean, they just sit in their apartment and write for 12, 14 hours a day.”

The show was a surprise hit for Netflix when it debuted in 2016, but Netflix had already greenlit a writer’s room for the second season, which meant that they had already hammered out the major beats of Season 2 before it was renewed. Stranger Things isn’t the only major show to face a year-long delay: the final season of HBO’s Game of Thrones is also expected to debut in 2019.