Starbucks reported a smaller-than-expected fall in first-quarter comparable sales on Tuesday, indicating early signs of success for CEO Brian Niccol's turnaround efforts for the coffee chain battling sluggish demand.

Starbucks has reported better-than-expected sales in its fiscal first quarter as some of its turnaround efforts start to take hold.

Starbucks on Tuesday reported better-than-expected sales in its fiscal first quarter as some of its turnaround efforts start to take hold.

Brian Niccol, who is four months into his new role, has set forth a raft of measures to improve the coffee chain's business.