Mastercard is planning a substantial hike in interchange fees to merchants post-Brexit. Mastercard insists that U.K. shoppers using a credit card will not be affected.

The company announced the fivefold increase in interchange fees, which it collects on behalf of banks on each transaction, will go into effect Oct. 15, according to a report in the Daily Business. The fee covers the cost of systems maintenance and fraud prevention.

Mastercard said the changes were in line with a 2019 agreement made with European Commission for transactions from all non-members.