diff --git a/src/targetspacertrsolver.hh b/src/targetspacertrsolver.hh
index 59d110f1176b11b63d85cd024ecb612fbdb877b6..19a44f2693acb0235273e038d0bf4b0007a9356c 100644
--- a/src/targetspacertrsolver.hh
+++ b/src/targetspacertrsolver.hh
@@ -9,6 +9,7 @@
 /** \brief Riemannian trust-region solver for geodesic finite-element problems */
 template <class TargetSpace>
 class TargetSpaceRiemannianTRSolver 
+    : public NumProc
 //     : public IterativeSolver<std::vector<TargetSpace>,
 //                             Dune::BitSetVector<TargetSpace::TangentVector::size> >
 {