The Mets recalled Smith from their alternate training site ahead of Wednesday's game against the Orioles, Mike Puma of the New York Post reports.
He'll join the New York bullpen as a replacement for Robert Gsellman, who was placed on the 10-day injured list with a fractured rib. Smith has made eight relief appearances for the Mets this season, giving up five earned runs on six hits and two walks over seven innings.