diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.C b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.C
index 7c63f1c262..42134dcded 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.C
@@ -186,7 +186,6 @@ Foam::scalar Foam::InjectionModel<CloudType>::setNumberOfParticles
 (
     const label parcels,
     const scalar volume,
-    const scalar volumeFraction,
     const scalar diameter,
     const scalar rho
 )
@@ -196,13 +195,14 @@ Foam::scalar Foam::InjectionModel<CloudType>::setNumberOfParticles
     {
         case pbMass:
         {
-            nP = volumeFraction*massTotal_/parcels
-               /(rho*mathematicalConstant::pi/6.0*pow3(diameter));
+            nP = volume/volumeTotal_
+                *massTotal_/rho
+               /(parcels*mathematicalConstant::pi/6.0*pow3(diameter));
             break;
         }
         case pbNumber:
         {
-            nP = volumeFraction*massTotal_/(rho*volume);
+            nP = massTotal_/(rho*volumeTotal_*parcels);
             break;
         }
         default:
@@ -363,9 +363,6 @@ void Foam::InjectionModel<CloudType>::inject(TrackData& td)
         return;
     }
 
-    // Volume fraction to introduce during this timestep
-    const scalar volFraction = volumeFraction(newVolume);
-
     // Duration of injection period during this timestep
     const scalar deltaT =
         max(0.0, min(carrierDt, min(time - SOI_, timeEnd() - time0_)));
@@ -418,7 +415,6 @@ void Foam::InjectionModel<CloudType>::inject(TrackData& td)
                     (
                         newParcels,
                         newVolume,
-                        volFraction,
                         pPtr->d(),
                         pPtr->rho()
                     );
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.H b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.H
index 05e009f4c6..dc3b9ff61b 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.H
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.H
@@ -183,7 +183,6 @@ protected:
         (
             const label parcels,
             const scalar volume,
-            const scalar volumeFraction,
             const scalar diameter,
             const scalar rho
         );
@@ -290,9 +289,6 @@ public:
             template<class TrackData>
             void inject(TrackData& td);
 
-            //- Return the volume fraction to introduce
-            inline scalar volumeFraction(const scalar volume) const;
-
 
         // Injection geometry
 
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModelI.H b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModelI.H
index 80a142816c..716208c092 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModelI.H
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModelI.H
@@ -96,14 +96,4 @@ Foam::label Foam::InjectionModel<CloudType>::parcelsAddedTotal() const
 }
 
 
-template<class CloudType>
-Foam::scalar Foam::InjectionModel<CloudType>::volumeFraction
-(
-    const scalar volume
-) const
-{
-    return volume/volumeTotal_;
-}
-
-
 // ************************************************************************* //