diff --git a/applications/solvers/multiphase/driftFluxFoam/relativeVelocityModels/relativeVelocityModel/relativeVelocityModel.C b/applications/solvers/multiphase/driftFluxFoam/relativeVelocityModels/relativeVelocityModel/relativeVelocityModel.C
index c8e3bb3..ce39cb9 100644
--- a/applications/solvers/multiphase/driftFluxFoam/relativeVelocityModels/relativeVelocityModel/relativeVelocityModel.C
+++ b/applications/solvers/multiphase/driftFluxFoam/relativeVelocityModels/relativeVelocityModel/relativeVelocityModel.C
@@ -59,7 +59,8 @@ Foam::relativeVelocityModel::relativeVelocityModel
             IOobject::AUTO_WRITE
         ),
         alphac_.mesh(),
-        dimensionedVector("Udm", dimVelocity, Zero)
+        dimensionedVector("Udm", dimVelocity, Zero),
+        mixture.U().boundaryField().types()
     )
 {}