Character controller won't climb steps if pushing at a wall

Hello.

I have a corridor with a stairway in it. The character controller climbs that fine if I stay away from the walls, but if I face a wall even slightly when climbing them, the character controller stops. It's like it's trying to climb the wall (and decides it can't), even though it could just slide along the wall and climb the stairs. This is very annoying, since the player could very easily get stuck in stairs like this.