Loto-Quebec wants Lotto Max players to check their Dec. 16 tickets to see if they are part of the group that won $40 million.
The Crown corporation says that the jackpot was won by a ticket containing 10 shares, and, to date, only five people have come forward.
"This means there are still five newly minted multimillionaires out there!" Loto-Quebec said. "The holders of the winning shares will be able to claim their prize before Christmas if they act quickly."
The winning ticket holders have a group-play ticket and purchased them in Montreal.
The winning numbers are: 06 - 22 - 25 - 42 - 43 - 45 - 48
Ticket holders can check their numbers at Loto-Quebec's website or on the corporation's app.
Winners are asked to call the customer service team at 1-866-611-5686.