Harry Potter actor Daniel Radcliffe is becoming concerned that he talks about his alter-ego as if he is a real person.

"I have actually started to talk about Harry as if he's another person I know, like one of my friends which is quite worrying," the star is quoted by Teen Hollywood as saying.

"And people who have known me for five years have started to call me Harry."

Harry Potter and the Goblet of Fire is released on November 18.