Former New York City Council Speaker Christine Quinn on Thursday endorsed her ex-rival, Mayor Bill de Blasio, for a second term.

“I’ve worked closely with Mayor de Blasio throughout his first term,” Quinn said in a statement.

“It’s clear that with every decision, he’s doing his part to ensure that New York puts progressive values first. He has proven to be a strong ally as the city reforms the homeless shelter and homeless services sector, works to create more affordable housing, and fights for resources in a hostile federal environment. I fully support his reelection.”

Quinn’s endorsement comes a day after de Blasio faced off against his sole primary opponent, Sal Albanese, in a televised debate on Wednesday.

Quinn unsuccessfully sought the Democratic mayoral nomination in 2013, losing to de Blasio in a crowded field.

She has also been close to a de Blasio rival, Gov. Andrew Cuomo, who selected her as a vice chair of the state Democratic Committee and has provided public support for the governor’s policies.