diff --git a/diffusivityModel/GasState/GasState.C b/diffusivityModel/GasState/GasState.C
index 1a2cb11..ba087fd 100644
--- a/diffusivityModel/GasState/GasState.C
+++ b/diffusivityModel/GasState/GasState.C
@@ -64,9 +64,9 @@ Foam::GasState::GasState(const scalar p, const scalar T, const scalarField &Y)
 {
     Y_ /= Foam::sum(Y_);
 
-    calculatX();
+    calculateX();
 
-    calculatW();
+    calculateW();
 }
 
 
@@ -79,9 +79,9 @@ Foam::GasState::GasState(const scalar p, const scalar T, tmp<scalarField> Y)
 {
     Y_ /= Foam::sum(Y_);
 
-    calculatX();
+    calculateX();
 
-    calculatW();
+    calculateW();
 }
 
 
diff --git a/diffusivityModel/GasState/GasState.H b/diffusivityModel/GasState/GasState.H
index 47f13cc..9b0e6e5 100644
--- a/diffusivityModel/GasState/GasState.H
+++ b/diffusivityModel/GasState/GasState.H
@@ -101,9 +101,9 @@ private:
 
         inline const thermoType &thermos(label i) const;
 
-        inline void calculatW() const;
+        inline void calculateW();
 
-        inline void calculatX() const;
+        inline void calculateX();
 
 
 public:
diff --git a/diffusivityModel/GasState/GasStateI.H b/diffusivityModel/GasState/GasStateI.H
index 11daf19..bf925f2 100644
--- a/diffusivityModel/GasState/GasStateI.H
+++ b/diffusivityModel/GasState/GasStateI.H
@@ -27,7 +27,7 @@ License
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-inline void Foam::GasState::calculatW() const
+inline void Foam::GasState::calculateW()
 {
     forAll(X_, i)
     {
@@ -36,7 +36,7 @@ inline void Foam::GasState::calculatW() const
 }
 
 
-inline void Foam::GasState::calculatX() const
+inline void Foam::GasState::calculateX()
 {
     forAll(X_, i)
     {