Burger King has reported that global sales at new outlets, that have been open for at least a year, were up 6.7% during the second quarter.
The firm also said that the return of its Chicken Fries in March, due to customer demand, for helping to drive a better-than-expected rise in second quarter sales.
Parent company, Restaurant Brands said new burgers, store improvements and special offers also helped to boost sales.
Restaurant Brands was created last year, when Burger King's majority shareholder, 3G Capital bought Canadian coffee and doughnut chain Tim Hortons for $11bn.
Burger King opened 141 new outlets in the period, and 52 new Tim Horton sites.