diff --git a/Processes/TrackingLine/Tracking.h b/Processes/TrackingLine/Tracking.h
index ab68080f9bfa6573c8f5185cb0d5b7aa0a18536d..0d099ca97ea18acaf2a9a9341b0dc5acf066d6f9 100644
--- a/Processes/TrackingLine/Tracking.h
+++ b/Processes/TrackingLine/Tracking.h
@@ -103,7 +103,7 @@ namespace corsika::process {
       template <typename TParticle, typename TMedium>
       static geometry::Intersections Intersect(const TParticle& particle,
                                                const geometry::Plane& plane,
-                                               const TMedium& medium) {
+                                               const TMedium&) {
         using namespace corsika::units::si;
         auto const delta = plane.GetCenter() - particle.GetPosition();
         auto const velocity =