Jankowski was recalled from Triple-A Fresno on Sunday, Brian McTaggart of MLB.com reports.
Jankowski had been dispatched to the minors just two days earlier to make room for Dallas Keuchel's (neck) activation from the disabled list, but the Astros will be able to bring the right-hander back on the active roster following Charlie Morton's (lat) surprise move to the DL. It's expected that Jankowski, who made his MLB debut Wednesday against the Tigers, will see largely mop-up duty in relief while he remains with the big club.