By Sarah Nassauer 

A key measure of sales at Costco Wholesale Corp. fell for the first time in nearly six years, as the strong dollar and low gasoline prices ate away at the retailer's revenue from international stores and gas pumps.

Comparable-store sales fell 1% for the three months ended May 10, the first quarterly drop for the warehouse-club retailer since 2009. International sales dropped 6%. U.S. sales inched up 1%.

The tepid sales numbers are out of character for Costco, which has been a rare consistent bright spot in the retail landscape for years. Gasoline prices and currencies are factors over which the company has little control. But Costco's exposure could grow in the years ahead as it adds fueling stations to more of its stores and builds up its international presence.

Shares of Costco, which is the second largest U.S. retailer after Wal-Mart Stores Inc., fell 0.8% to $144.26 in Thursday trading.

Profit rose to $516 million in the third quarter from $473 million a year earlier. Total revenue rose to $26.1 billion from $25.8 billion a year earlier.

Underlying traffic was strong. Without the impact of gasoline and foreign currency fluctuations, sales at stores open for at least a year jumped 6%, outshining Wal-Mart and some other competitors. Costco drew more shoppers to its stores, and the average amount spent on each trip increased about 2.5%, excluding gasoline and currency fluctuations

Unlike traditional retailers, Costco's primary source of profit is membership fees, not sales in stores. Sales of memberships rose to $584 million from $561 million a year earlier.

Membership revenue evens out fluctuations in sales and allows Costco to offer discounted products from large screen TVs to organic string cheese, drawing more people to its stores.

Costco is one of the largest sellers of gasoline in the U.S. It plans to add more pumps to stores around the world, executives said. Selling inexpensive gas brings in people who then buy other items during their trips and boosts membership. Gas accounted for about 10% of Costco's sales in the third quarter, Chief Financial Officer Richard Galanti said on an earnings call.

The company is opening as many stores outside the U.S. as it is in the country, gradually increasing the percentage of its sales that come from international locations. International sales, including Canada, account for about 30% of the total, according to company filings.

Costco now has 673 membership warehouses around the world. Those outside the U.S. are primarily in Canada, Mexico and the U.K. The company said it plans to open 14 new warehouse stores before the end of August, half in the U.S. and half international.

Write to Sarah Nassauer at sarah.nassauer@wsj.com

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