Consider there to be a digital picket line around Amazon’s upcoming Prime Day. Workers in a Shakopee, Minnesota, warehouse are staging a walkout for six hours of Prime Day to protest harsh working conditions.

Amazon’s answer to the workers’ protest is that it raised wages to a $15 minimum. Which is good. But it’s not what they’re talking about here. The workers are talking about the strict quotas they have to meet to keep their jobs, quotas that lead to physically punishing work. They’re talking about warehouse temperatures and broken sprinkler systems. And they want to push Amazon to turn more temp jobs into permanent jobs.

This will be the first U.S. work stoppage for Amazon, though the company’s European warehouse workers have held strikes. Minnesota Amazon warehouses, though, have been the site of successful organizing by Muslim workers seeking accommodations during Ramadan, when they’re fasting. Pilots who fly for Amazon—and have their own issues with the company—are sending a representative to the strike and said in a statement that “We hope that Amazon takes seriously these striking workers’ calls for change.”