The trailer for China's largest ever film production The Great Wall has been released online, though not all are happy about it.

The $150 million blockbuster is set 1,000 years ago in ancient China and "tells the story of an elite force making a valiant stand for humanity on the world’s most iconic structure.", as the publicity material tease says.

The film features Chinese superstars Andy Lau, Wang Junkai, and Jing Tian and is directed by Chinese heavyweight Zhang Yimou. However, it's Matt Damon and Willem Dafoe in starring roles that seems to be ruffling feathers online. Claims of 'whitewashing' flooded onto Twitter when the trailer was released.

Although the role of Damon's character is not yet clear, it doesn't look like he's been made to look Chinese. Regardless, the trailer has been well received in China where not many seemed fussed about Damon's role in the film.

The Great Wall will be released in February 2017 and is set to be the first big-budget, English-language Chinese blockbuster.

You can watch the full trailer below.