The seventh and final Harry Potter book is going to be split into two films.
Film bosses reckon there's way too much going on in Harry Potter and the Deathly Hallows to be able to squeeze it all into one movie.
Producer David Heyman said: "Unlike every other book, you cannot remove elements of this book."
The news will probably please fans who've been disappointed when key scenes from the books have been left out of other Potter films.
Daniel Radcliffe, who plays the teenage wizard, says splitting the film in two is the only sensible option.
"There have been subplots in the other books that have made them easier to cut - although those cuts were still to the horror of some fans," he told American newspaper, the Los Angeles Times.
"The seventh book doesn't really have any subplots. It's one driving, pounding story from the word go."
But some fans are thought to be angry at the idea as they think film bosses are just trying to make as much cash out of the Potter movies while they still can.
Part one of Harry Potter and the Deathly Hallows is expected to be released in November 2010, with the second and final film hitting cinema screens in the summer of 2011.
But the next movie out is Harry Potter and the Half-Blood Prince, which is currently being filmed.