By Julie Jargon 

McDonald's Corp. said its same-store sales in the U.S. fell again last month, extending its longest stretch without comparable growth in its core market in more than a decade.

The world's largest restaurant company cited "ongoing broad-based challenges" on Monday as it posted a 1% decline in May in sales for U.S. restaurants open at least 13 months. That marked the sixth month in the past seven when sales dropped in its largest market by number of restaurants. For April, McDonald's said U.S. same-store sales were flat from a year earlier.

The continued slump in May comes despite efforts to revive the Golden Arches brand. McDonald's Chief Executive Don Thompson, who is approaching his second anniversary at the helm, has said that McDonald's has lost relevance with some consumers and is trying to regain that.

McDonald's has been focusing on improving staffing at busy times, updating Ronald McDonald and its Happy Meals and emphasizing its breakfast and coffee offerings.

"McDonald's U.S. business is heightening its customer focus through service, value and menu initiatives to stabilize results," the company said.

The recent slump in growth in McDonald's U.S. business is the longest since it posted a string of 13 months of negative same-store sales from February 2002 to March 2003, according to Sanford Bernstein analyst Sara Senatore.

The company still has points of strength. Breakfast in the U.S. remains a robust business for McDonald's despite new challenges from rivals, analysts say, with no decrease in sales following the high-profile launch in March of a breakfast menu by Yum Brands Inc.'s Taco Bell unit.

And McDonald's global same-store sales rose 0.9% in May, driven by strong growth in China, the U.K. and France.

To keep shareholders happy, McDonald's recently announced plans to increase the amount of money it returns to investors through stock buybacks and dividends.

McDonald's shares were down around 0.5% in midday trading on Monday at $101.47 each. That is up more than 4% for the year, but below its all-time high in April of last year.

Write to Julie Jargon at julie.jargon@wsj.com

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