Oslo - Olympic ski-jump champion Lars Bystoel of Norway has tested positive for doping, reports said Friday.

Bystoel told the weekly gossip magazine Se og Hoer that he "had tested positive" but said the substance was "not performance enhancing and was not taken in connection with a competition."

According to the weekly the 30-year-old has tested positive for THC, a substance found in marijuana.

The test was conducted in connection with a competition in November 2008.

Bystoel won gold in the normal hill event at the 2006 Winter Olympics in Turin.

Norwegian ski-jump sports manager Clas Brede Braathen said he was concerned for Bystoel.

"I hope he can use this to move on," Braathen told news agency NTB.

During his career, Bystoel has battled with alcohol-related problems and at times has been suspended from the national team. (dpa)