If you forget to join the electoral roll come election day, your vote will now still be counted.

The Electoral Amendment Bill passed its third reading in Parliament on Wednesday. It will allow people to enrol to vote and update their details on voting day itself.

Justice Minister Andrew Little says there won't be a repeat of 2017, when about 19,000 potential voters were disenfranchised on voting day as they weren't enrolled.

"Thousands more didn't have their votes counted because their details weren't up to date."

Voting booths in supermarkets and malls will be a new addition this year too, while changes to improve the efficiency and timeliness of overseas, postal and dictation voting are yet to come.

"We've made it easier for New Zealanders to exercise their democratic right to vote," said Little.