McDonald's says a key sales figure fell 2.5 percent in July, dragged down by persistent weakness in the U.S. and the impact of a food safety scandal in China.
The world's biggest hamburger chain says the global decline included a 3.2 percent drop in the U.S. and a 7.3 percent drop in Asia, the Middle East and Africa.
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The company, based in Oak Brook, Illinois, has been struggling to boost sales in the U.S. amid heightening competition and shifting eating habits.
In China, sales took a significant hit after a TV report showed workers at one of its suppliers repackaging expired meat. Many restaurants there were unable to serve burgers and chicken as a result.
McDonald's Corp. said the scandal has put its global sales forecast for 2014 "at risk."
Its shares slipped in premarket trading Friday.