Mushinski was recalled by the Astros on Saturday, Chandler Rome of The Athletic reports.
This will be Mushinski's fourth separate stint in the big-league bullpen this season. The 27-year-old lefty owns a 2.79 ERA and 11:3 K:BB in 9.2 innings at the highest level. Phil Maton (elbow) landed on the injured list in a corresponding move.