Felipe Nasr admitted his crash during final practice for the Canadian Grand Prix was his own fault.
The Brazilian was weaving down the back straight to try to warm up his tyres when he lost control of his Sauber and crashed heavily against the wall.
Nasr revealed afterwards that he had pressed the DRS button by mistake and lost grip while weaving.
"I think it was a combination of things, but at the same time it was simple," said Nasr. "I was trying to bring up my tyres up to temperature. That was probably my second lap trying to weave on them.
"At the same time we could see that the wind was a lot stronger today and I think when I was doing the weaving somehow I pressed the DRS button. It's simple.
"It's nothing I could have done because it happened so quickly.
"But I think it's understood what happened and at least the team did a fantastic job to put the car together."
He reckons the position of the button is not a problem and he is confident the mistake will not happen again.
"It's the first time it's happened. Maybe just the way I was doing the weaving maybe I pressed it somehow," he said.
"I don't see it being a problem. It's just a matter of paying attention, trying to avoid it. It's the first time that really happened.