diff --git a/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.C b/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.C
index 02e8978c..c7b92f04 100644
--- a/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.C
+++ b/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.C
@@ -56,7 +56,6 @@ staticPressure::staticPressure
     g_(propsDict_.lookup ("g_DEM")),
     voidfractionFieldName_(propsDict_.lookup("voidfractionFieldName")),
     voidfraction_(sm.mesh().lookupObject<volScalarField> (voidfractionFieldName_)),
-    rhoPart_(readScalar(propsDict_.lookup ("rhoPart"))),
     solidFraction_(readScalar(propsDict_.lookup ("DomainSolidVolumeFraction")))
 {
     // init force sub model
@@ -76,7 +75,7 @@ void staticPressure::setForce() const
 {
     #include "setupProbeModel.H"
     label cellI;
-    scalar rhoMix_ = solidFraction_*rhoPart_ + (1.0-solidFraction_)*rhoGas_;
+    scalar rhoMix_ = solidFraction_*particleCloud_.particleDensity(0) + (1.0-solidFraction_)*rhoGas_;
     vector force;
 
     for(int index = 0; index < particleCloud_.numberOfParticles(); ++index)
diff --git a/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.H b/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.H
index 4f1fba88..868619b8 100644
--- a/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.H
+++ b/src/lagrangian/cfdemParticle/subModels/forceModel/staticPressure/staticPressure.H
@@ -65,8 +65,6 @@ private:
 
     const volScalarField& voidfraction_;
 
-    scalar rhoPart_;
-
     scalar solidFraction_;
 
 public: