The head of the Philippines’ state-run lottery operator has given illegal number game operators an ultimatum: go legal or go to jail.

On Tuesday, Philippine Charity Sweepstakes Office (PCSO) general manager Alexander Balutan told local media that the Small Town Lottery (STL) was the “only legal and authorized numbers game nationwide” and the PCSO had “both an invitation and warning” for illegal operators: “go legal.”

As of last year, there were only 18 STL agent corporations authorized to do business in the Philippines but this figure will rise to 56 when the PCSO officially launches the STL expansion on January 31. When all the new authorized STL agents are operational, PCSO chairman Jose Jorge Corpuz says the government expects STL revenue to rise by over P2b (US $40.2m) per month, boosting the annual haul to nearly P28b.

The boost in STL agents follows a recent campaign by the PCSO and Philippine National Police (PNP) to stamp out illegal jueteng numbers game operators. While the campaign was apparently successful in convincing some unauthorized operators to go legit, a Senate hearing on Tuesday featured testimony from PNP officials explaining why anti-illegal gambling operations had declined in recent months.