diff --git a/corsika/setup/SetupEnvironment.hpp b/corsika/setup/SetupEnvironment.hpp
index 831cf3f6b310e1e2135384a50b0b9cd56d4f2b86..b7f59b31b6aa34d914206285f37463ce4981cb37 100644
--- a/corsika/setup/SetupEnvironment.hpp
+++ b/corsika/setup/SetupEnvironment.hpp
@@ -22,8 +22,7 @@ namespace corsika::setup {
      bdependent way.
    */
 
-  using EnvironmentInterface =
-      IRefractiveIndexModel<IMediumPropertyModel<IMagneticFieldModel<IMediumModel>>>;
+  using EnvironmentInterface = IMediumPropertyModel<IMagneticFieldModel<IMediumModel>>;
   using Environment = Environment<EnvironmentInterface>;
 
 } // end namespace corsika::setup