diff --git a/dune/solvers/iterationsteps/multigridstep.hh b/dune/solvers/iterationsteps/multigridstep.hh
index d079d9d56c34804f13a484049f2700083052a332..dc7f667d686e899b6c1b0028328848f2fffd9cc9 100644
--- a/dune/solvers/iterationsteps/multigridstep.hh
+++ b/dune/solvers/iterationsteps/multigridstep.hh
@@ -227,7 +227,7 @@ namespace Dune {
         std::vector<VectorType> rhsHierarchy_;
 
         //protected:
-        std::vector<MultigridTransfer<VectorType, BitVectorType, MatrixType>* > mgTransfer_;
+        std::vector<const MultigridTransfer<VectorType, BitVectorType, MatrixType>* > mgTransfer_;
 
     protected: