Wenger is pleased to keep their top four hopes alive.
He said: "We had a quick start and a strong start for the first 20 minutes. We were really dominating and after that we became a bit conservative and pushed forward less and allowed Wigan back in the game. We were unfortunate to go to 1-1 because I think it was a free kick for us.
"It was a big blow for our team and you could see that when we came out in the second half - we were not as fluent or as confident as we wanted to be. Wojceich made a great save at 1-1. At that stage we were on the brink of conceding a goal."