Warner Bros. may be sticking firm to its third Half-Blood Prince release date, but that won’t prevent delays for the film.

Due to a conflict with a previously scheduled blockbuster, most IMAX theaters (aside from one in New York in one in LA) will not be able to show Harry Potter and the Half-Blood Prince until July 29. That equates to a two-week delay from the July 15 premiere.

What will be occupying those theaters up until that point? Transformers: Revenge of the Fallen. The Paramount feature has a month-long commitment starting with its June 26 debut.