I found a great flight from PDX to CVG through ORD this June. I am nervous because there is a 40 min time between flights, and the flight details say "terminal change". Is this doomed to failure? I've had bad luck through ORD in the past. The way back is 1 hr 5 min, so that doesn't sound as bad. Thoughts?

(wasn't sure which forum, sorry if this is in the wrong section)