diff --git a/opm/core/transport/implicit/TransportSolverTwophaseImplicit.cpp b/opm/core/transport/implicit/TransportSolverTwophaseImplicit.cpp
index 7ca58932..c43aeb2c 100644
--- a/opm/core/transport/implicit/TransportSolverTwophaseImplicit.cpp
+++ b/opm/core/transport/implicit/TransportSolverTwophaseImplicit.cpp
@@ -26,6 +26,9 @@
   along with OPM.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif // HAVE_CONFIG_H
 
 #include <opm/core/transport/implicit/TransportSolverTwophaseImplicit.hpp>
 #include <opm/core/simulator/TwophaseState.hpp>