McDonald's

(MCD) - Get Report

said its U.S. same-store sales rose 3.5% last month owing to the success of its new Snack Wraps and continuing interest in its breakfast items.

Systemwide sales for McDonald's restaurants worldwide increased 8.6% in August, or 7.1% in constant currencies, the burger seller said Tuesday.

Comp sales were up 8.8% in Europe as nearly every country had a positive performance, including France, Germany and the U.K. Same-store sales in the Asia-Pacific, Middle East and Africa climbed 6.1%, primarily because of strong results in Japan.

Overall, comp sales were up 6%. Shares of McDonald's, a component of the

Dow Jones Industrial Average

, rose 19 cents to $37.31 before the opening bell.