JEFFERSON CITY, Mo. — Yet another Missouri lawmaker has resigned just ahead of a new constitutional amendment limiting his ability to become a lobbyist.

Democratic Rep. Courtney Allen Curtis resigned at 11:59 p.m. Wednesday. That was one minute before a voter-approved amendment took effect requiring lawmakers to wait two years before registering as lobbyists.

State law had required only a six-month lobbyist waiting period.

Curtis, of Ferguson, will give up about $3,000 in salary by resigning a month before his term was to end. His resignation letter didn’t cite a reason.

There now are 13 vacancies in the 163-member House and three in the 34-member Senate. Nearly a third of those came after voters approved Constitutional Amendment 1 on Nov. 6.

Some left earlier to take jobs in Gov. Mike Parson’s administration.