Updated from 3:17 a.m. ESTISSAQUAH, Wash. ( TheStreet) -- Costco Wholesale ( COST) said same-store sales in December rose 9%, while international same sales gained 25%. Analysts surveyed by Thomson Reuters expected Costco to post a same-store sales increase in December of 7.9%. Costco, the warehouse retailer, said total sales for the five weeks ended Jan. 3 rose 11% to $8.26 billion. In December, Costco's U.S. same-store sales rose 5%. Costco said it benefited in the month from higher gas prices and stronger foreign currencies. Excluding these factors, December same-store sales in the U.S. rose 2%, and international same sales gained 10%. -- Reported by Joseph Woelfel in New York. Follow TheStreet.com on Twitter and become a fan on Facebook.