Amazon is once again doubling down on its return-to-office mandate, warning staff that not complying could impact their chances of being promoted.

Employees who don’t regularly work in an office at least three days a week will find that any potential promotion will be subject to an additional layer of leadership approval, the e-commerce giant confirmed to CNN on Friday.

There are a “variety of factors we consider when determining an employee’s readiness for the next level,” Brad Glasser, an Amazon spokesperson, told CNN in a statement.