A 55-year-old typo is finally being fixed.

Workers on Wednesday replaced the first of 19 signs missing the second “Z” in Verrazzano-Narrows Bridge, accurately spelling the last name of Giovanni de Verrazzano for the first time since the bridge opened in 1964.

The Italian was the first European explorer to sail into New York Harbor, but a typo in the bridge’s initial construction contract meant the span was dubbed “Verrazano.”

The omission on the span connecting Brooklyn and Staten Island went mostly unnoticed for years — until October 2018, when Gov. Andrew Cuomo signed legislation adding the second “Z.”

At the time, MTA officials said replacing the signs would cost $200,000 to $250,000.

The first new sign went up Wednesday morning at 92nd Street near Fort Hamilton Parkway in Bay Ridge.

In a statement, the MTA said it will replace the signs “gradually to avoid incurring costs above and beyond normal replacement.”