diff --git a/ProcessLib/ComponentTransport/ComponentTransportProcessData.h b/ProcessLib/ComponentTransport/ComponentTransportProcessData.h
index 6169b4830ed460167bc1205da39ba765c76bb470..b959136301a31b745b46f2dee11c586040a70489 100644
--- a/ProcessLib/ComponentTransport/ComponentTransportProcessData.h
+++ b/ProcessLib/ComponentTransport/ComponentTransportProcessData.h
@@ -23,9 +23,6 @@ class Medium;
 
 namespace ProcessLib
 {
-template <typename ReturnType>
-struct Parameter;
-
 namespace ComponentTransport
 {
 struct ComponentTransportProcessData
@@ -33,11 +30,9 @@ struct ComponentTransportProcessData
     ComponentTransportProcessData(
         std::unique_ptr<MaterialPropertyLib::MaterialSpatialDistributionMap>&&
             media_map_,
-        ParameterLib::Parameter<double> const& decay_rate_,
         Eigen::VectorXd const& specific_body_force_, bool const has_gravity_,
         bool const non_advective_form_)
         : media_map(std::move(media_map_)),
-          decay_rate(decay_rate_),
           specific_body_force(specific_body_force_),
           has_gravity(has_gravity_),
           non_advective_form(non_advective_form_)
@@ -46,7 +41,6 @@ struct ComponentTransportProcessData
 
     std::unique_ptr<MaterialPropertyLib::MaterialSpatialDistributionMap>
         media_map;
-    ParameterLib::Parameter<double> const& decay_rate;
     Eigen::VectorXd const specific_body_force;
     bool const has_gravity;
     bool const non_advective_form;
diff --git a/ProcessLib/ComponentTransport/CreateComponentTransportProcess.cpp b/ProcessLib/ComponentTransport/CreateComponentTransportProcess.cpp
index 5bcc7d00c680972f60a9e6c0f2a3095a0bcf606d..31b6fe0edf5e218676d6eb9189546e524a4e35d3 100644
--- a/ProcessLib/ComponentTransport/CreateComponentTransportProcess.cpp
+++ b/ProcessLib/ComponentTransport/CreateComponentTransportProcess.cpp
@@ -110,12 +110,6 @@ std::unique_ptr<Process> createComponentTransportProcess(
         }
     }
 
-    // Parameter for the decay rate.
-    auto const& decay_rate = ParameterLib::findParameter<double>(
-        config,
-        //! \ogs_file_param_special{prj__processes__process__ComponentTransport__decay_rate}
-        "decay_rate", parameters, 1, &mesh);
-
     // Specific body force parameter.
     Eigen::VectorXd specific_body_force;
     std::vector<double> const b =
@@ -145,7 +139,6 @@ std::unique_ptr<Process> createComponentTransportProcess(
 
     ComponentTransportProcessData process_data{
         std::move(media_map),
-        decay_rate,
         specific_body_force,
         has_gravity,
         non_advective_form};