The 2008 world champion told Sky Sports News: "Montreal was a bit of a strange one for me. I felt I had the pace right from the beginning of the weekend, but things just never quite came together. It's frustrating when these things are out of your hands.
"I caught up before and I can catch up again. It's going to take another four wins to make the difference so I'm going to do my best to get those results. Right now, I'm just looking ahead to the next race in Austria and another chance to catch up to the lead."
The first Austrian Grand Prix since 2003 will take place next weekend.