A photo posted on Twitter showing Mayor Valérie Plante on a Montreal terrasse caused the mayor to admit an error in a tweet on May 29.
The photo, first shared by Radio-Canada, shows Plante sitting at a table with four other people in apparent violation of public health rules.
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In Quebec red zones, restaurants can currently only seat customers outside on terrasses with a maximum of two people from different addresses at the same table.
An Instagram story posted by Plante on Friday night shows her sitting at a terrasse table with one other person, which is allowed under current rules.
"It is my mistake," Plante tweeted, referring to the Radio-Canada report.
"I was eating with a friend, and the chef and two members of my team came to sit with us for a few minutes. We should have put our masks back on. It shows that we must be vigilant and that we are not immune from an error despite our good intentions," she said.