The signage outside a historic McDonald's restaurant is seen in Downey, California February 18, 2015. REUTERS/Lucy Nicholson McDonald's US same-store sales fell more than expected in May.

Sales at McDonald's stores open for at least a year fell 2.2% in May compared to the prior year, more than the 1.7% decline that was expected.

Global comparable store sales fell 0.3% May, however, less than the 0.9% decline that was expected.

In Europe, comparable-store-sales rose 2.3% against expectations for a 0.6% increase.

In a release, CEO Steve Easterbrook said, "McDonald's has embarked on a turnaround plan to reignite our business performance... Our goal is to be a modern, progressive burger company that is responsive to consumers' evolving preferences, provides a contemporary experience for our customers and drives long-term value for our system and our shareholders."

Last month, a spokesperson told Bloomberg the company would no longer report these numbers after July, which have been deteriorating for several months.