SACRAMENTO (CBS SF) – For millions of Californians who obtained a REAL ID card with only one proof of residency, a return visit to the Department of Motor Vehicles may not be needed.

The DMV said it will send letters to 3.4 million Californians who got the new cards prematurely. Customers would only need to check a box to confirm their mailing address, sign and date the letter, and send it back in a prepaid envelope.

READ MORE: SF Restaurant Apologizes for Denying Service to Armed, On-Duty Police Officers

DMV officials hope this fix will spare REAL ID holders a trip to one of their offices, after federal officials discovered millions of ID cards were sent out without a required 2nd proof of residency.

READ MORE: International Travelers Brace For New COVID Testing Requirement

Meanwhile, DMV offices across the state have been dealing with long wait times as millions seek to get the federally approved drivers’ licenses and cards.

MORE NEWS: Northbound San Tomas Expressway in Santa Clara Closed by 'Major Injury' Accident

Starting in October 2020, a REAL ID card is needed to fly without a passport.