A complaint of uncooked chicken from McDonald's in Timaru sparked a nationwide recall of their McBites product earlier this month.
McDonald's received a complaint from a customer via social media that they had received raw chicken McBites from the Timaru restaurant.
McDonald's NZ spokesman Simon Kenny told 1News the incident was immediately investigated and escalated to the national head office.
It was discovered that the cause of the issue was an incorrect product size specification in production, rather than human error in the restaurant.
"In an abundance of caution, McDonald's stopped selling product nationwide while replacement stock was distributed," Kenny said.
Restaurants were restocked late last week and operations are back to normal, Kenny said.
A Ministry for Primary Industries spokesperson said it was a trade level recall, where the affected food was removed from the distribution line but had not extended to food already sold to customers.
Kenny said the restaurant management in Timaru had apologised to the customer.