Heathrow has apologised after Chinese passengers shopping in duty-free were made to pay more than other people in order to gain a discount.
Chinese shoppers had to spend at least £1,000 in order to be given a 20% off voucher for further shopping, according to The Straits Times.
However others shopping at the airport were subject to a minimum spend of £250 for the same voucher, the BBC said.
The offer was put on by World Duty Free, which is a commercial partner of London's Heathrow Airport.
The issue was raised after a Chinese student who was working at the airport posted about the offer on Weibo, the Chinese equivalent of Twitter.
He claimed he had attempted to give a Chinese woman a voucher after she spent roughly £300, however he was told by his manager that she wasn't entitled to it as she was Chinese and therefore needed to spend £1,000 instead.
Online the student slammed the management as "white-skinned pigs," explaining that he'd been in the UK for seven years but this is "the first time that I've felt injustice and racism so deeply."
News website Sixth Tone reported that the manager had admitted to the part-time assistant that the promotion was a "little bit unfair."
World Duty Free has now said in a statement on Weibo it has altered the offer so it does not mean Chinese people have to pay more, following an investigation.
Heathrow Airport has also issued an apology on both Twitter and Weibo about the matter.