diff --git a/src/core/numerics/ohm/ohm.hpp b/src/core/numerics/ohm/ohm.hpp
index 39a27172e..b4bc34ddf 100644
--- a/src/core/numerics/ohm/ohm.hpp
+++ b/src/core/numerics/ohm/ohm.hpp
@@ -365,7 +365,7 @@ class Ohm : public LayoutHolder<GridLayout>
     auto spatial_hyperresistive_(VecField const& J, VecField const& B, Field const& n,
                                  MeshIndex<VecField::dimension> index) const
     { // TODO : https://github.com/PHAREHUB/PHARE/issues/3
-        auto const lvlCoeff = std::pow(4, layout_->levelNumber());
+        auto const lvlCoeff = 1. / std::pow(4, layout_->levelNumber());
 
         auto computeHR = [&](auto BxProj, auto ByProj, auto BzProj, auto nProj) {
             auto const BxOnE = GridLayout::project(B(Component::X), index, BxProj);