Rising inflation has forced the company “to make some tough choices” over pricing, McDonald’s UK & Ireland CEO, Alistair Macrow, said in a statement to customers on Wednesday.

The cost of a cheeseburger in Britain went up 20% from 99 pence ($1.19) to £1.19 ($1.40).

The increase comes as inflation in the UK peaked at 9.4% in June, the highest level in 40 years, mostly driven up by soaring energy and fuel costs.

On Tuesday McDonald’s, which runs more than 36,000 restaurants in more than 100 countries, reported a nearly 10% jump in global sales for the three months to the end of June, compared to the same period last year.