Biogenesis founder Anthony Bosch’s prison sentence for his steroid distribution conviction has been reduced from 48 months to 32 months, a U.S. District judge in Florida ruled on Thursday.

Federal prosecutors asked judge Darrin Gayles last week to reduce Bosch’s sentence because of his “substantial assistance” to the government’s prosecution of others.

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Bosch pleaded guilty last February to illegally supplying steroids and other performance-enhancing drugs to professional baseball players, most notably the Yankees’ Alex Rodriguez, as well as college and high school athletes.

Bosch also was the key witness in Major League Baseball’s case against Rodriguez, who was suspended for the entire 2014 season for using performance-enhancing drugs.