Urquidy will start Wednesday's game against the Athletics, Brian McTaggart of MLB.com reports.
Urquidy will make a spot start after the Astros used multiple long relievers in Tuesday's 21-7 loss. The 24-year-old has a 5.33 ERA, 1.30 WHIP and 24:5 K:BB in six major-league outings this season (27 innings). The Astros' schedule would allow them to get by without a fifth starter until Sept. 28, so Urquidy will presumably shift back to the bullpen after Wednesday's outing.