diff --git a/applications/solvers/multiphase/reactingEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C b/applications/solvers/multiphase/reactingEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
index 2bc5d377d..38f3fdb05 100644
--- a/applications/solvers/multiphase/reactingEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
+++ b/applications/solvers/multiphase/reactingEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -63,7 +63,7 @@ Foam::dragModels::Ergun::~Ergun()
 Foam::tmp<Foam::volScalarField> Foam::dragModels::Ergun::CdRe() const
 {
     return
-        (4/3)
+        (4.0/3.0)
        *(
             150
            *max
diff --git a/applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C b/applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
index 2bc5d377d..38f3fdb05 100644
--- a/applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
+++ b/applications/solvers/multiphase/twoPhaseEulerFoam/interfacialModels/dragModels/Ergun/Ergun.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -63,7 +63,7 @@ Foam::dragModels::Ergun::~Ergun()
 Foam::tmp<Foam::volScalarField> Foam::dragModels::Ergun::CdRe() const
 {
     return
-        (4/3)
+        (4.0/3.0)
        *(
             150
            *max