Height limitations have always been a challenge for some amusement park guests, as safety features on thrill rides aren’t designed to accommodate every rider.

But Mario fans flocking to Universal Studios Hollywood this month for the opening of Super Nintendo World may find themselves unable to enjoy the park’s most exciting attraction, this time because of their waistline.

In recent years, theme parks around the country have become more stringent about safety and the restraints used on ride vehicles, and it’s not just for high-speed attractions like roller coasters that can take riders through inverted loops and steep curves.

On top of that, there’s now even more emphasis on safely securing smaller children in the same seats used by adult riders, which contributes to more limitations for larger guests.

Jeff Polk, the senior vice president of resort operations at Universal Orlando Resort, told the Wall Street Journal that many of its parks’ attractions offer test seats located outside the rides as a result, allowing guests to test restraints and capacity ahead of time to avoid finding themselves turned away after waiting hours in line.

Some attractions, like Universal’s Islands of Adventure’s The Incredible Hulk Coaster in Florida, now offer certain seats specifically designed for larger guests.