diff --git a/Processes/UrQMD/UrQMD.h b/Processes/UrQMD/UrQMD.h
index 0b34e2e147a94c58a933d0cf508a428be5c7b917..11c8a0eb9a14268f1729a2fbf23508bcf024bcb4 100644
--- a/Processes/UrQMD/UrQMD.h
+++ b/Processes/UrQMD/UrQMD.h
@@ -15,6 +15,7 @@ namespace corsika::process::UrQMD {
   class UrQMD : public corsika::process::InteractionProcess<UrQMD> {
   public:
     UrQMD();
+    void Init() {}
     corsika::units::si::GrammageType GetInteractionLength(
         corsika::setup::Stack::StackIterator&, corsika::setup::Trajectory&) const;