# Cutting centered hole in mirrored object with subsurf

My problem, as you can see on the image below, is basically that the subsurf interpolation of the centered hole in that mirrored plane does not transform into a circle as intended.

I know that this is completely correct, since it just takes into account the additional vertex on the mirror axis, but is there any clever way to fix or work around this except fiddling around with the vertices manually?