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The global supply chain crisis is causing a chip shortage for Mcdonald's in Japan.
The Big Mac's home is not a lack of semiconductors that is causing the problem.
The firm said it is experiencing delays of shipments of potatoes used to make French fries.
It will only sell small portions of its French fries in Japan from Friday until 30 December.
McDonald's Japan will temporarily limit sales of Medium- and Large-sized French Fries as a preventative measure to ensure customers can continue to enjoy McDonald's French Fries.
Small-sized French Fries will still be available at all of our restaurants. There have been no breaks in supply, according to the company.
McDonald's usually imports potatoes from a port in Canada.
The impact of the Pandemic on the global supply chain has caused delays for ships.
The company said in a statement that it will use alternative measures, including flying supplies to Japan.
McDonald's in Japan has had to downsize its portions before.
There was a shortage of French fries in the US in the summer of 2014, due to a lengthy industrial dispute.
McDonald's Japan took the emergency step of only selling small portions of French fries while it flew in 1,000 tonnes of potatoes.
In August this year, McDonald's said it was facing supply issues affecting the availability of shakes and bottled drinks at its 1,250 outlets in the UK.
The company said a nationwide shortage of lorry drivers was one reason behind the disruptions.
Changes to rules following the UK's exit from the European Union have caused a shortage of drivers.
The caption is media.
The global supply chain is disrupting.
