Amazon chief executive Andy Jassy told employees in a Tuesday memo that he expects artificial intelligence to thin their ranks, reducing headcount at what is now the United States’ second-largest private employer.

Amazon CEO Andy Jassy says advancements in AI will “reduce” the company’s corporate headcount over the next few years. In a memo to employees on Tuesday, Jassy writes that Amazon expects the change due to “efficiency gains from using AI extensively across the company,” without specifying how many employees would be affected.