Revised figures in the United States show the economy grew at a pace of 2.5% in the second quarter of the year.
The Commerce Department said that was more than double the pace recorded in the previous three months.
The BBC reports the rise is a further sign that the economy may be getting back on track.
The government originally estimated that GDP grew at a 1.7% rate in the second quarter.
Housing and business investment remained strong: housing construction grew at an annual rate of 12.9%, the fourth consecutive quarter of double-digit growth.
Meanwhile, business investment was revised upwards to 16.1%.