diff --git a/dune/mmdg/problems/mmdgproblem6.hh b/dune/mmdg/problems/mmdgproblem6.hh
index c191e5aa33e9cf97245b216871498e66ac98c123..c1f9d63886ff9f48c38b1aef8f66ee401f9906e2 100644
--- a/dune/mmdg/problems/mmdgproblem6.hh
+++ b/dune/mmdg/problems/mmdgproblem6.hh
@@ -61,8 +61,8 @@ public:
     const Scalar hyperbolicFactor =
       (coshsqrt2 * coshsqrt2 - (2 * xi_ - 1) * sinhsqrt2 * sinhsqrt2);
 
-    return -48.0 * d0_ * d0_ * std::exp(-8.0 * pos[1]) * hyperbolicFactor * ( cos4y
-      + 3.0 * std::sin(4.0 * pos[1]) ) - sqrt2 * std::sinh(sqrt2) * cos4y;
+    return -16.0 * d0_ * d0_ * std::exp(-8.0 * pos[1]) * hyperbolicFactor * (
+      cos4y + 3.0 * std::sin(4.0 * pos[1]) ) - sqrt2 * std::sinh(sqrt2) * cos4y;
   }
 
   //aperture d of the fracture at position pos