The Astros claimed left-hander Player Page for Buddy Boshers off waivers from the Twins on Monday.
The 29-year-old had a 4.89 ERA in 38 relief appearances with Minnesota last season. Boshers held left-handed batters in check, allowing a .224 batting average and a .258 on-base percentage.
He spent the past two seasons with the Twins and pitched for the Angels in 2013.
With the addition of Boshers, the Astros' 40-man roster stands at 39.