Chicago Mayor Lori Lightfoot will give city workers, including police officers, who didn’t get their first dose of the COVID-19 vaccine by Sunday a chance to get the shot before placing them on no-pay status, she said Monday.

Lightfoot implemented a rule requiring city workers get vaccinated by March 13 or lose pay. Asked Monday how the city would enforce its policies, Lightfoot said supervisors would call workers in to verify that they aren’t vaccinated and give them an opportunity to comply. They will then be given an order to get vaccinated and if they don’t, she said, then they’ll be placed on no-pay status, which is considered nondisciplinary, the Chicago Tribune reports.

That gives the city flexibility as it balances its public health rules with staffing issues, particularly in the Chicago Police Department. “We’re not doing mass firings today,” Lightfoot said.