diff --git a/dune/gfe/averageinterface.hh b/dune/gfe/averageinterface.hh
index 1cbbd5cf9f31468f034e8c52f9e08cafce21c2f3..0cef863bbf19a7b5cc935e5ffccabe8e55c9a932 100644
--- a/dune/gfe/averageinterface.hh
+++ b/dune/gfe/averageinterface.hh
@@ -3,6 +3,7 @@
 
 #include <dune/common/fmatrix.hh>
 #include <dune/localfunctions/lagrange/pqkfactory.hh>
+#include <dune/istl/solvers.hh>
 
 #include <dune/fufem/dgindexset.hh>
 #include <dune/fufem/crossproduct.hh>