diff --git a/SU2_CFD/include/fluid/CFluidScalar.hpp b/SU2_CFD/include/fluid/CFluidScalar.hpp
index 9f5c9108c51..e3295d99b6d 100644
--- a/SU2_CFD/include/fluid/CFluidScalar.hpp
+++ b/SU2_CFD/include/fluid/CFluidScalar.hpp
@@ -41,7 +41,6 @@ class CFluidScalar final : public CFluidModel {
  private:
   const int n_species_mixture;            /*!< \brief Number of species in mixture. */
   su2double Gas_Constant;           /*!< \brief Specific gas constant. */
-  const su2double Gamma;                  /*!< \brief Ratio of specific heats of the gas. */
   const su2double Pressure_Thermodynamic; /*!< \brief Constant pressure thermodynamic. */
   const su2double GasConstant_Ref;        /*!< \brief Gas constant reference needed for Nondimensional problems. */
   const su2double Prandtl_Number;         /*!< \brief Prandlt number.*/
@@ -106,7 +105,7 @@ class CFluidScalar final : public CFluidModel {
   /*!
    * \brief Constructor of the class.
    */
-  CFluidScalar(su2double val_Cp, su2double val_gas_constant, su2double val_operating_pressure, const CConfig* config);
+  CFluidScalar(su2double val_operating_pressure, const CConfig* config);
 
   /*!
    * \brief Set viscosity model.
diff --git a/SU2_CFD/src/fluid/CFluidScalar.cpp b/SU2_CFD/src/fluid/CFluidScalar.cpp
index 991e29bd562..5e3a2e2f998 100644
--- a/SU2_CFD/src/fluid/CFluidScalar.cpp
+++ b/SU2_CFD/src/fluid/CFluidScalar.cpp
@@ -41,12 +41,9 @@
 #include "../../include/fluid/CPolynomialViscosity.hpp"
 #include "../../include/fluid/CSutherland.hpp"
 
-CFluidScalar::CFluidScalar(su2double val_Cp, su2double val_gas_constant, su2double value_pressure_operating,
-                           const CConfig* config)
+CFluidScalar::CFluidScalar(su2double value_pressure_operating, const CConfig* config)
     : CFluidModel(),
       n_species_mixture(config->GetnSpecies() + 1),
-      Gas_Constant(val_gas_constant),
-      Gamma(config->GetGamma()),
       Pressure_Thermodynamic(value_pressure_operating),
       GasConstant_Ref(config->GetGas_Constant_Ref()),
       Prandtl_Number(config->GetPrandtl_Turb()),
diff --git a/SU2_CFD/src/solvers/CIncEulerSolver.cpp b/SU2_CFD/src/solvers/CIncEulerSolver.cpp
index 5b81394bd9a..215445d2c5e 100644
--- a/SU2_CFD/src/solvers/CIncEulerSolver.cpp
+++ b/SU2_CFD/src/solvers/CIncEulerSolver.cpp
@@ -325,7 +325,7 @@ void CIncEulerSolver::SetNondimensionalization(CConfig *config, unsigned short i
 
       config->SetGas_Constant(UNIVERSAL_GAS_CONSTANT / (config->GetMolecular_Weight() / 1000.0));
       Pressure_Thermodynamic = config->GetPressure_Thermodynamic();
-      auxFluidModel = new CFluidScalar(config->GetSpecific_Heat_Cp(), config->GetGas_Constant(), Pressure_Thermodynamic, config);
+      auxFluidModel = new CFluidScalar(Pressure_Thermodynamic, config);
       auxFluidModel->SetTDState_T(Temperature_FreeStream, config->GetSpecies_Init());
       break;
 
@@ -482,7 +482,7 @@ void CIncEulerSolver::SetNondimensionalization(CConfig *config, unsigned short i
         break;
 
       case FLUID_MIXTURE:
-        fluidModel = new CFluidScalar(Specific_Heat_CpND, Gas_ConstantND, Pressure_ThermodynamicND, config);
+        fluidModel = new CFluidScalar(Pressure_ThermodynamicND, config);
         fluidModel->SetTDState_T(Temperature_FreeStreamND, config->GetSpecies_Init());
         break;