Jeffrey Ayotte, speaking from Peterborough, Ont., says the case has been set over to Dec. 4 to allow for disclosure of evidence.
He expects that by then, they may be able to set a date for pretrial meetings. The case may go to trial in June, but it's not clear yet.
Del Mastro and his official campaign agent, Richard McCarthy, are accused of wilfully overspending during the campaign and of submitting documents to Elections Canada that they knew or should have known were false.
Del Mastro faces a maximum penalty of five years in prison and a $5,000 fine.
Del Mastro denies the charges. He says he followed all the rules for the campaign.