diff --git a/src/targetspacertrsolver.cc b/src/targetspacertrsolver.cc
index c4d9522686e0f45d8633780ac90938e77a967a3c..b95edcee8044570038e0eaac98a8bc32ff614941 100644
--- a/src/targetspacertrsolver.cc
+++ b/src/targetspacertrsolver.cc
@@ -2,6 +2,8 @@
 // For using a monotone multigrid as the inner solver
 #include <dune/solvers/iterationsteps/trustregiongsstep.hh>
 #include <dune/solvers/solvers/iterativesolver.hh>
+#include <dune/solvers/norms/energynorm.hh>
+
 #include "maxnormtrustregion.hh"
 
 template <class TargetSpace>