Updated

Disney says it's going to boost enforcement of its popular FASTPASS reservation service.

Disney's free FASTPASS reservation system allows guests to come back to a ride at a specified time within a one-hour window if they don't want to wait.

Walt Disney World and Disneyland have been letting visitors come back any time after that window and still be admitted to the FastPass line. Now Disney says it is putting an end to any wiggle room.

The Inside the Magic blog reports that Walt Disney World is now enforcing both the beginning and end times, allowing guests holding a FastPass to only return during the one-hour window stated on the slip.

"Walt Disney World is now enforcing both the beginning and end times, allowing guests holding a (FastPass) to only return during the one-hour window stated on the slip. And though it will affect regulars who know how to use the leniency to their advantage, most Walt Disney World guests already do return during the designated time window and likely won't notice much of a difference," writes Ricky Brigante of Inside the Magic.

Some say this is the first step in making way for Disney World's yet-to-be-revealed ride reservation system called XPass, where resort guests can reserve their ride times weeks and months in advance. And it is expected to allow for bookings for character meet and greets and key viewing spots for parades and fireworks.

"Given the tremendous popularity of FastPass with our guests, in fairness to all we want to ensure we provide the same opportunity to everyone," said Disney spokesman Rick Sylvain. But, he told the Atlanta Journal-Constitution, "if a guest experiences extenuating circumstances that affect their ability to return, we will deal with that on a case-by-case basis."

The Associated Press contributed to this report.