Update, Feb. 27: The D.C. Board of Elections now says the number of voters who received mailers with the wrong primary date on them is upwards of 25,000, more than five higher than it initially said. It also says it will be sending new voter registration cards to all of those voters.

Original:

Mailers sent to at least 5,000 D.C. voters in recent weeks incorrectly stated that the city’s primary election is on the “3rd Tuesday in June,” when in fact it will take place on June 2.

The mailer from the D.C. Board of Elections, an independent city agency, accompanied voter registration cards, and included basic information on when elections happen and what offices voters can cast ballots for. But the date for the upcoming June primary was outdated, still listing the primary as happening on June 16.

Last year, the D.C. Council passed a bill moving the primary date up two weeks to June 2 after councilmembers raised concerns that the city would be the last to cast votes in the presidential nominating contest. (The primary date has changed a number of times in recent years.) That law became effective in December.

“The purpose of the communication was to provide the voter with their voter registration card. Unfortunately, it included outdated information about the June Primary Election date. We regret the error and will correct it in all future communications,” the elections board wrote in a statement.

“We have planned a number of future communications about important events in this election cycle, and voters will be well informed about when and where to vote,” it added.

The relatively high number of voters who received the wrong primary date was likely linked to D.C.’s new automatic voter registration system, which registers a person to vote or updates their voting information anytime they go to the Department of Motor Vehicles or other government offices for services. More than 43,000 D.C. residents have been registered to vote under the system, which took effect in February 2017.

“Erroneous information can confuse voters at best and disenfranchise voters at worst. Election officials must share correct and accurate information about upcoming elections, and their respective legislatures need to get them the resources they need to do so,” said Myrna Pérez, director of the Voting Rights and Elections Program at the Brennan Center for Justice at NYU Law.

In 2014, a voter guide sent to hundreds of thousands of D.C. voters by the elections board included an image of an upside-down D.C. flag on the cover. And ahead of the 2018 elections, the board failed to include a notification that postage was required on absentee ballots.

The June 2 primary for presidential and local races will be limited to voters who are registered with a major political party. On June 16, all voters in Ward 2 will be able to cast ballots in a special election to select someone to finish out the term of former Ward 2 Councilmember Jack Evans, who resigned from office in January.

This story originally appeared on WAMU.