Amazon.com Inc. will raise its minimum wage to $15 an hour, but it will come at the expense of monthly bonuses and stock awards for hourly workers so the company can help pay for those raises.

In a blog post Tuesday, Amazon confirmed it was phasing out its stock-grant program and incentive pay. Currently, warehouse and other hourly workers are given two Amazon shares at their hiring, and receive one additional stock option every year, according to The Verge. A single Amazon share is currently worth about $1,952.

In an emailed statement, an Amazon spokesperson said the stock-grant program, which would vest in 2020 and 2021, would be replaced by a direct stock-purchase plan by the end of 2019.

Bloomberg News reported Wednesday that workers who were already paid at least $15 an hour would get a $1-an-hour raise, reportedly frustrating some long-time employees who may not benefit as much as the lowest-paid workers.

Read: Amazon’s $15 minimum wage could put pressure on other retailers to raise pay

An Amazon spokesperson said its workers will see an overall increase in compensation. “We’ve heard from our hourly fulfillment and customer service employees that they prefer the predictability and immediacy of cash to [restrictive stock units],” Amazon said in a statement. “The net effect of this change and the new higher cash compensation is significantly more total compensation for employees, without any vesting requirements, and with more predictability.”

But some workers challenged that. Several Amazon warehouse workers told The Verge that they worry they could actually see a pay decrease after missing out on thousands of dollars in incentive pay, which reportedly can reach 8% a month and 16% during the peak holiday season. In the U.K., where hourly workers also got a raise this week, some Amazon warehouse workers told The Guardian that the stock and incentive-pay cuts could offset about half the amount they’d get in raises, with one union leader saying it’s “a stealth tax on its own wage increase.”

The company will reportedly review employees’ concerns ahead of the new pay structure, scheduled to take effect Nov. 1. Amazon has more than 250,000 employees in the U.S., and expects to hire about 100,000 seasonal workers over the holidays.