diff --git a/src/scheme/FiniteVolumesDiffusion.hpp b/src/scheme/FiniteVolumesDiffusion.hpp
index b4a794d0f5c254ba72014096d40cccc70ab97736..3acadd1b5a63aaa1a1b446289d31c9166ca3b2c0 100644
--- a/src/scheme/FiniteVolumesDiffusion.hpp
+++ b/src/scheme/FiniteVolumesDiffusion.hpp
@@ -278,6 +278,8 @@ public:
     Kokkos::View<double*> kL = unknowns.kL();
     Kokkos::View<double*> kR = unknowns.kR();
 
+    uR[0][0] = -t/(1.-t*t);
+
     const Kokkos::View<const Rd*> xj = m_mesh_data.xj();
     const Kokkos::View<const double*> Vj = m_mesh_data.Vj();
     const Kokkos::View<const Rd**> Cjr = m_mesh_data.Cjr();