diff --git a/dune/solvers/test/mmgtest.cc b/dune/solvers/test/mmgtest.cc
index ce8d5e4294e4847746ae8df45ea100b6e4d2f3f4..c10f409e4fcd1e273964ac52f7fa748680190dba 100644
--- a/dune/solvers/test/mmgtest.cc
+++ b/dune/solvers/test/mmgtest.cc
@@ -16,6 +16,7 @@
 // dune-solver includes
 #include <dune/solvers/norms/energynorm.hh>
 #include <dune/solvers/iterationsteps/mmgstep.hh>
+#include <dune/solvers/solvers/quadraticipopt.hh>
 #include <dune/solvers/transferoperators/mandelobsrestrictor.hh>