Bottles are typically ordered a year in advance, too, so brewers, especially smaller ones, can’t just grab a new pallet or two. Instead, they’re appealing to customers to help them out.

Germany’s not having a great summer.

Mesut Ozil has quit the national soccer team (saying racism was the cause). Chancellor Angela Merkel and U.S. President Donald Trump have been sniping at each other. And to top it all off, German brewers say they’re about to run out of beer bottles.

Germans don’t drink their beer out of cans. (This is the country that’s home to the Reinheitsgebot, a beer purity law that has been enforced for over 500 years, after all.) Instead, they pay a deposit on bottles, which is refunded when they’re returned. But an ongoing heat wave throughout the country has discouraged people from bringing those bottles back in. And that’s causing problems.

Bottles are typically ordered a year in advance, too, so brewers, especially smaller ones, can’t just grab a new pallet or two. Instead, they’re appealing to customers to help them out.

“We need your help!” the Moritz Fiege brewery posted on Facebook. “Great weather + great beer = serious thirst. The catch: although we regularly buy new bottles, we’re running out. So before you go on your summer holiday, please be sure to return your Moritz Fiege empties. … Make your motto: first the empties, then the holiday!”