System of a Down has pulled the plug on a pair of Los Angeles shows after frontman Serj Tankian announced he’s tested positive for COVID-19.

The 54-year-old Tankian, who revealed his diagnosis Thursday on social media, says he tested positive in spite of being fully vaccinated and having been “incredibly careful” throughout the pandemic. The news comes eight months after Tankian called the pandemic “devastating.”

System of a Down’s weekend appearances at the Banc of California Stadium have been pushed back to February 4th and 5th of next year, the band has announced.