diff --git a/opm/simulators/linalg/ExtractParallelGridInformationToISTL.cpp b/opm/simulators/linalg/ExtractParallelGridInformationToISTL.cpp
index 80f1f7aa4..4a811a622 100644
--- a/opm/simulators/linalg/ExtractParallelGridInformationToISTL.cpp
+++ b/opm/simulators/linalg/ExtractParallelGridInformationToISTL.cpp
@@ -22,6 +22,8 @@
 #include <opm/simulators/linalg/ParallelIstlInformation.hpp>
 #include <dune/common/version.hh>
 #include <dune/common/shared_ptr.hh>
+#include <opm/grid/CpGrid.hpp>
+
  namespace Opm
 {
 #if defined(HAVE_OPM_GRID)
diff --git a/opm/simulators/linalg/ExtractParallelGridInformationToISTL.hpp b/opm/simulators/linalg/ExtractParallelGridInformationToISTL.hpp
index e32cb694f..5b658206c 100644
--- a/opm/simulators/linalg/ExtractParallelGridInformationToISTL.hpp
+++ b/opm/simulators/linalg/ExtractParallelGridInformationToISTL.hpp
@@ -21,9 +21,10 @@
 #define OPM_EXTRACTPARALLELGRIDINFORMATIONTOISTL_HEADER_INCLUDED
 #ifdef HAVE_OPM_GRID
 
-#include<opm/grid/CpGrid.hpp>
 #include <any>
 
+namespace Dune { class CpGrid; }
+
 namespace Opm
 {