Harrison Ford labeled Shia LaBeouf a "f**king idiot" for criticizing Indiana Jones and the Crystal Skull.

The 68-year-old actor - who played the titular character in the fourth installment of the franchise, with Shia playing his son - does not believe it was correct of the 25-year-old star to say he "dropped the ball" on the movie because it is his duty to "support" a film.

"I think I told him he was a f**king idiot. As an actor, I think it's my obligation to support the film without making a complete ass of myself. Shia is ambitious, attentive and talented - and he's learning how to deal with a situation which is very unique and difficult," Ford told Details.

Shia portrayed Mutt Williams in the 2008 movie, and speaking last year said it was his "fault" the movie - which took $786.6 million at the box office worldwide - did not work, adding Harrison was also not "happy" with the final product:

"I feel like I dropped the ball on the legacy that people loved and cherished. You get to monkey-swinging and things like that and you can blame it on the writer and you can blame it on Steven Spielberg, who directed. But the actor's job is to make it come alive and make it work, and I couldn't do it. So that's my fault. Simple. [Harrison and I] had major discussions. He wasn't happy with it either. Look, the movie could have been updated. There was a reason it wasn't universally accepted."