OAKVILLE, Ont. -- The parent of Tim Hortons and Burger King missed analyst estimates for first-quarter revenue and adjusted earnings but the company says it got 2015 off to a good start at the operational level.

Restaurant Brands International (TSX:QSP) says it had US$932 million of total revenue for the three months ended March 31, little-changed from what it would have had last year if the two companies had been combined.

Revenue from the Tim Hortons portion of the business, reported in U.S. dollars, was US$682.4 million -- down $8.3 million or 1.2 per cent from a year earlier.

The company said the Tim Hortons revenue were dampened by foreign exchange fluctuatations and would have been 11 per cent higher than a year ago of the dollar's value was constant.

An $8.7-million increase in Burger King's revenue, which rose to $249.6 million, offset the decline at Tim Hortons.

Comparable-store sales were up at both segments, with Tim Hortons showing a 5.3 per cent increase and Burger King rising 4.6 per cent from the first quarter of 2014.

"We are off to a strong start in 2015, having achieved one of our best quarters of comparable sales growth in years for both of our iconic brands," said Daniel Schwartz, chief executive officer of Restaurant Brands International.

"We have established a solid foundation in our first full quarter as RBI and will look to build on this momentum throughout the rest of the year."

Restaurant Brands also reported an $8.1 million net loss attributable to shareholders, or four cents per share, and adjusted net income was $83.6 million or 18 cents per share.

Analysts had estimated $949.65 of revenue and 20 cents per share of adjusted earnings for the quarter, according to estimates compiled by Thomson Reuters.