diff --git a/dune/mmdg/problems/mmdgproblem6.hh b/dune/mmdg/problems/mmdgproblem6.hh
index afec3955f679e93ab010acb5ca76248f7d44faa2..ee0320ff268b4b0f3b7e72d58e47194a6bc91bc3 100644
--- a/dune/mmdg/problems/mmdgproblem6.hh
+++ b/dune/mmdg/problems/mmdgproblem6.hh
@@ -95,7 +95,7 @@ public:
 
     for (int i = 0; i < dim; i++)
     {
-      permeability[i][i] = 1.0 * aperture(pos);//d_;
+      permeability[i][i] = 1.0 * aperture(pos);
     }
 
     return permeability;