diff --git a/exercises/exercise-basic/injection2pniproblem.hh b/exercises/exercise-basic/injection2pniproblem.hh
index 77e417628476b40431045e06cb8507a4fb4e8c4d..5d03855918653c1227ee2d31bc21cba1f6644df8 100644
--- a/exercises/exercise-basic/injection2pniproblem.hh
+++ b/exercises/exercise-basic/injection2pniproblem.hh
@@ -59,7 +59,7 @@ SET_TYPE_PROP(Injection2pNITypeTag, SpatialParams,
                                      typename GET_PROP_TYPE(TypeTag, Scalar)>);
 
 // Set fluid configuration
-SET_TYPE_PROP(Injection2pNITypeTag, FluidSystem, FluidSystems::H2ON2<typename GET_PROP_TYPE(TypeTag, Scalar), false>);
+SET_TYPE_PROP(Injection2pNITypeTag, FluidSystem, FluidSystems::H2ON2<typename GET_PROP_TYPE(TypeTag, Scalar), FluidSystems::H2ON2DefaultPolicy</*fastButSimplifiedRelations=*/ true>>);
 } // end namespace Properties
 
 /*!