When director James Cameron released Avatar in 2009, it broke records, eventually becoming the high-grossing film of all time. However, it’s been six long years since then, and no sequel… and there won’t be one this year or next.

Cameron recently told the AP that writing three Avatar sequels has proven more difficult than he expected, and now, he’s delaying the first new film a year. It’s not expected to drop in late 2017.

According to the report, the director plans to film the anticipated sequels all at one time, and then release the three films over consecutive years.

The first was due in late 2016, but he said the writing process had proved to be “very involved” and that the initial target date was probably too ambitious.

“There’s a layer of complexity in getting the story to work as a saga across three films that you don’t get when you’re making a stand-alone film,” he said.

The first film brought in nearly $2.8 billion at the box office, and was named best drama at the Golden Globes and won Academy Awards for cinematography, visual effects and art direction.

Cameron shot the original movie in New Zealand and is planning to shoot the sequels there.