The leading election official in Michigan is recommending that the one and a half million people in the state with absentee ballots should drop them personally in a drop box or hand-deliver them to their local clerk’s office, rather than use the mail.

The suggestion comes with two weeks to go before the election. Secretary of State Jocelyn Benson says delivering the ballot by hand ensures that it will arrive to be counted before 8 p.m. on Election Night.

Benson also says those who still wish to request an absentee ballot can do so, but should do it in person, rather than by mail.

Roughly half of Michigan’s 3 million requested absentee ballots have already been returned.