diff --git a/opm/simulators/linalg/ParallelIstlInformation.cpp b/opm/simulators/linalg/ParallelIstlInformation.cpp
index 7cd233d26..79ac900e0 100644
--- a/opm/simulators/linalg/ParallelIstlInformation.cpp
+++ b/opm/simulators/linalg/ParallelIstlInformation.cpp
@@ -350,6 +350,6 @@ INSTANCE(int)
 INSTANCE(float)
 INSTANCE(std::size_t)
 
-#endif
+} // namespace Opm
 
-}
+#endif // HAVE_MPI && HAVE_DUNE_ISTL