The Reds recalled Petty from Triple-A Louisville on Wednesday, Gordon Wittenmyer of The Cincinnati Enquirer reports.
Petty will give the bullpen some length after the Reds needed to use six relievers in Tuesday's extra-innings victory over the Padres. The righty has made two starts for Cincinnati this season, yielding seven runs with a 2:3 K:BB over 10.2 innings.