London: Matt Damon says he often gets mistaken for actor Mark Wahlberg.
The `Elysium` star said that he has spoken to Wahlberg, who is often faced with the same problem, reported Digital Spy.
"I`ve talked to Mark about this because he gets people (that) come up and say, `I love you in The Bourne Identity`. So Mark and I have a deal. If we`re mistaken for one another, we have to be as polite as possible," he said.
Damon, 42, said that the strict diet he adopted for `Elysium` made him grumpy.
"I was grumpy on this set, because I was on a diet for the whole movie. I think I shut up a little bit and keep to myself (when I diet)," he added.