The news follows reports that Ridley Scott's sci-fi blockbuster will be given an R rating in the US.
Scott previously hinted that studio executives could tone down the content of the film to secure a more lucrative PG-13 or 12A certificate, but it will arrive in both territories without cuts or edits.
Prometheus, which stars Noomi Rapace, Charlize Theron, Idris Elba and Michael Fassbender, tells the story of explorers on an alien planet. It marks the director's first sci-fi venture since 1982's Blade Runner.
The movie will be connected to the Alien universe, but Scott has insisted that it will stand alone and tell its own story.
Prometheus is scheduled for release on June 1 in the UK and June 8 in the US.
Photo gallery - Prometheus stills: