McDonald's bosses were forced to apologise after a sign attempting to ban teenagers from entering the premises during the evening was put up in a London branch.
The misspelt sign put on the doors of the Sidcup restaurant read: "No youths will be serverd [sic] after 7pm". It has since been taken down.
The attempt by local to ban teenagers came after a group of young people caused "sustained disruption" on Saturday night, a McDonald's spokesperson told the Evening Standard.
However the ban, which was imposed by local managers, led to dozens of angry teenagers filling the restaurant just before 7pm on Monday in protest, while others took to Twitter to complain.
A McDonald's spokeswoman said: "I can confirm that there is no age restriction policy in place at the McDonald's restaurant on Sidcup High Street.
"On Saturday evening, the restaurant experienced problems with a group of individuals causing sustained disruption to the restaurant, affecting fellow customers and employees. As a result the restaurant management took urgent steps to try and prevent repeat anti-social behaviour.
"The wording of the initial signage displayed in the restaurant was incorrect and we apologise for any confusion caused. McDonald's is a family-friendly restaurant that welcomes everyone through its doors."
A police spokesperson confirmed they were called to reports of anti-social behaviour at the branch on Saturday.