diff --git a/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.cpp b/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.cpp
index 205094692065ef70e270b8b53773be1c6f558d0f..bbea95d169bea5b66a3010f13fe194f6cb1c29c5 100644
--- a/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.cpp
+++ b/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.cpp
@@ -90,16 +90,6 @@ double TwoPhaseFlowWithPPMaterialProperties::getGasDensity(const double p,
     return _gas_density->getValue(vars);
 }
 
-double TwoPhaseFlowWithPPMaterialProperties::getGasDensityDerivative(
-    const double p, const double T) const
-{
-    ArrayType vars;
-    vars[static_cast<int>(MaterialLib::Fluid::PropertyVariableType::T)] = T;
-    vars[static_cast<int>(MaterialLib::Fluid::PropertyVariableType::p)] = p;
-
-    return _gas_density->getdValue(vars,
-                                   MaterialLib::Fluid::PropertyVariableType::p);
-}
 double TwoPhaseFlowWithPPMaterialProperties::getLiquidViscosity(
     const double p, const double T) const
 {
diff --git a/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.h b/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.h
index 618bf871e2447a5b3bc6d18df6734e3e1d91c217..a5576ffee84be841d6693db3ea6b4435c6da8e2d 100644
--- a/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.h
+++ b/MaterialLib/TwoPhaseModels/TwoPhaseFlowWithPPMaterialProperties.h
@@ -98,7 +98,6 @@ public:
     double getGasDensity(const double p, const double T) const;
     double getGasViscosity(const double p, const double T) const;
     double getLiquidViscosity(const double p, const double T) const;
-    double getGasDensityDerivative(double const p, double const T) const;
     double getNonwetRelativePermeability(
         const double t, const ParameterLib::SpatialPosition& pos,
         const double p, const double T, const double saturation) const;