diff --git a/corsika/detail/modules/energy_loss/BetheBlochPDG.inl b/corsika/detail/modules/energy_loss/BetheBlochPDG.inl
index b6ed1a0d22d2d74a1cf28ca17bd6833ec25fdec6..bfff9ffbb477d694de2b6c9b2742f5a90fb947e4 100644
--- a/corsika/detail/modules/energy_loss/BetheBlochPDG.inl
+++ b/corsika/detail/modules/energy_loss/BetheBlochPDG.inl
@@ -220,7 +220,7 @@ namespace corsika {
     auto energyCount = HEPEnergyType::zero();
 
     auto const factor = -dE / deltaX;
-    auto fill = [&](int const bin, double const weight) {
+    auto fill = [&](int const bin, GrammageType const weight) {
       auto const increment = factor * weight;
       profile_[bin] += increment;
       energyCount += increment;