diff --git a/opm/core/flowdiagnostics/AnisotropicEikonal.cpp b/opm/core/flowdiagnostics/AnisotropicEikonal.cpp
index 6a18f8063..42248401b 100644
--- a/opm/core/flowdiagnostics/AnisotropicEikonal.cpp
+++ b/opm/core/flowdiagnostics/AnisotropicEikonal.cpp
@@ -17,6 +17,7 @@
   along with OPM.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <config.h>
 #include <opm/core/flowdiagnostics/AnisotropicEikonal.hpp>
 #include <opm/core/grid/GridUtilities.hpp>
 #include <opm/core/grid.h>