diff --git a/test/multidomain/boundary/freeflowporenetwork/1p_1p/problem_freeflow.hh b/test/multidomain/boundary/freeflowporenetwork/1p_1p/problem_freeflow.hh
index 87f7c54c54f2f8cecdc8099d2fdfd10cc91008ec..b8c9ef89b0f9621b203f5d8bf457b67dd5262fde 100644
--- a/test/multidomain/boundary/freeflowporenetwork/1p_1p/problem_freeflow.hh
+++ b/test/multidomain/boundary/freeflowporenetwork/1p_1p/problem_freeflow.hh
@@ -166,7 +166,8 @@ public:
     {
         BoundaryFluxes values(0.0);
         const auto& globalPos = scvf.ipGlobal();
-        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipConditions::BJ>;
+        using SlipVelocityHelper = SlipVelocityHelper<typename GridGeometry::DiscretizationMethod, SlipConditions::BJ>;
+        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipVelocityHelper>;
 
         if constexpr (ParentType::isMomentumProblem())
         {
diff --git a/test/multidomain/boundary/freeflowporousmedium/1p_1p/convergence/problem_freeflow.hh b/test/multidomain/boundary/freeflowporousmedium/1p_1p/convergence/problem_freeflow.hh
index 3b393db2ce624a7cb802790601bad313a7088a28..7910f3bac756f4246b50d31a6a3cae1822978d0f 100644
--- a/test/multidomain/boundary/freeflowporousmedium/1p_1p/convergence/problem_freeflow.hh
+++ b/test/multidomain/boundary/freeflowporousmedium/1p_1p/convergence/problem_freeflow.hh
@@ -164,7 +164,8 @@ public:
     {
         BoundaryFluxes values(0.0);
         const auto& globalPos = scvf.ipGlobal();
-        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipConditions::BJS>;
+        using SlipVelocityHelper = SlipVelocityHelper<typename GridGeometry::DiscretizationMethod, SlipConditions::BJS>;
+        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipVelocityHelper>;
 
         // momentum boundary conditions
         if constexpr (ParentType::isMomentumProblem())
diff --git a/test/multidomain/boundary/freeflowporousmedium/1p_1p/problem_freeflow.hh b/test/multidomain/boundary/freeflowporousmedium/1p_1p/problem_freeflow.hh
index 582f0cb0e990f886742be9ef99e7c1befafa0d6d..4639936c7efb1bb7df9cf01f85db384084e00e0d 100644
--- a/test/multidomain/boundary/freeflowporousmedium/1p_1p/problem_freeflow.hh
+++ b/test/multidomain/boundary/freeflowporousmedium/1p_1p/problem_freeflow.hh
@@ -180,7 +180,8 @@ public:
     {
         BoundaryFluxes values(0.0);
         const auto& globalPos = scvf.ipGlobal();
-        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipConditions::BJS>;
+        using SlipVelocityHelper = SlipVelocityHelper<typename GridGeometry::DiscretizationMethod, SlipConditions::BJS>;
+        using FluxHelper = NavierStokesMomentumBoundaryFlux<typename GridGeometry::DiscretizationMethod, SlipVelocityHelper>;
 
         if constexpr (ParentType::isMomentumProblem())
         {