diff --git a/opm/simulators/linalg/FlexibleSolver1.cpp b/opm/simulators/linalg/FlexibleSolver1.cpp
index 440d412ea..8ca3b5c05 100644
--- a/opm/simulators/linalg/FlexibleSolver1.cpp
+++ b/opm/simulators/linalg/FlexibleSolver1.cpp
@@ -44,6 +44,7 @@ template class Dune::FlexibleSolver<BM<1>, BV<1>>;
 // Variants using Opm::MatrixBlock blocks.
 template class Dune::FlexibleSolver<OBM<1>, BV<1>>;
 
+#if HAVE_MPI
 
 using Comm = Dune::OwnerOverlapCopyCommunication<int, int>;
 
@@ -52,3 +53,4 @@ template Dune::FlexibleSolver<OBM<1>, BV<1>>::FlexibleSolver(const MatrixType& m
                                                              const boost::property_tree::ptree& prm,
                                                              const std::function<BV<1>()>& weightsCalculator);
 
+#endif // HAVE_MPI
diff --git a/opm/simulators/linalg/FlexibleSolver2.cpp b/opm/simulators/linalg/FlexibleSolver2.cpp
index 837b1fab9..bed962a65 100644
--- a/opm/simulators/linalg/FlexibleSolver2.cpp
+++ b/opm/simulators/linalg/FlexibleSolver2.cpp
@@ -44,6 +44,7 @@ template class Dune::FlexibleSolver<BM<2>, BV<2>>;
 // Variants using Opm::MatrixBlock blocks.
 template class Dune::FlexibleSolver<OBM<2>, BV<2>>;
 
+#if HAVE_MPI
 
 using Comm = Dune::OwnerOverlapCopyCommunication<int, int>;
 
@@ -52,3 +53,4 @@ template Dune::FlexibleSolver<OBM<2>, BV<2>>::FlexibleSolver(const MatrixType& m
                                                              const boost::property_tree::ptree& prm,
                                                              const std::function<BV<2>()>& weightsCalculator);
 
+#endif // HAVE_MPI
diff --git a/opm/simulators/linalg/FlexibleSolver3.cpp b/opm/simulators/linalg/FlexibleSolver3.cpp
index 68890230d..8e5a37c7c 100644
--- a/opm/simulators/linalg/FlexibleSolver3.cpp
+++ b/opm/simulators/linalg/FlexibleSolver3.cpp
@@ -44,6 +44,7 @@ template class Dune::FlexibleSolver<BM<3>, BV<3>>;
 // Variants using Opm::MatrixBlock blocks.
 template class Dune::FlexibleSolver<OBM<3>, BV<3>>;
 
+#if HAVE_MPI
 
 using Comm = Dune::OwnerOverlapCopyCommunication<int, int>;
 
@@ -52,3 +53,4 @@ template Dune::FlexibleSolver<OBM<3>, BV<3>>::FlexibleSolver(const MatrixType& m
                                                              const boost::property_tree::ptree& prm,
                                                              const std::function<BV<3>()>& weightsCalculator);
 
+#endif // HAVE_MPI
diff --git a/opm/simulators/linalg/FlexibleSolver4.cpp b/opm/simulators/linalg/FlexibleSolver4.cpp
index d2a4b2d03..4d32cc34e 100644
--- a/opm/simulators/linalg/FlexibleSolver4.cpp
+++ b/opm/simulators/linalg/FlexibleSolver4.cpp
@@ -44,6 +44,7 @@ template class Dune::FlexibleSolver<BM<4>, BV<4>>;
 // Variants using Opm::MatrixBlock blocks.
 template class Dune::FlexibleSolver<OBM<4>, BV<4>>;
 
+#if HAVE_MPI
 
 using Comm = Dune::OwnerOverlapCopyCommunication<int, int>;
 
@@ -52,3 +53,4 @@ template Dune::FlexibleSolver<OBM<4>, BV<4>>::FlexibleSolver(const MatrixType& m
                                                              const boost::property_tree::ptree& prm,
                                                              const std::function<BV<4>()>& weightsCalculator);
 
+#endif // HAVE_MPI