Ticketholders standing outside the Manhattan theater were given a leaftlet, which read, "Due to a sudden case of bronchitis, tonight's performance of 'Manilow on Broadway' has been canceled."
A makeup performance was added for Feb. 26.
Ticketholders who plan to attend that concert should bring their original tickets with them. Those unable to make that date are entitled to an exchange for an alternate performance or full refund, show reps said.
"Barry Manilow on Broadway" began performances Jan. 18 at the St. James Theatre. It is to run through Feb. 23.
This marks the 69-year-old singer's return to the Great White Way for the first time in more than two decades.
The Grammy Award-winning artist has sold more than 80 million records worldwide and has racked up 50 Top 40 hit songs, including "Mandy," "It's A Miracle," "Could It Be Magic," "I Write the Songs," "Tryin' to Get the Feeling Again," "This One's For You," "Weekend in New England," "Looks Like We Made It," "Can't Smile Without You," "Even Now" and "Copacabana [At the Copa.]"