diff --git a/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.C b/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.C
index 33a0ce8de9..36586ca10b 100644
--- a/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.C
+++ b/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.C
@@ -409,7 +409,7 @@ bool Foam::functionObjects::phaseScalarTransport::execute()
     // Solve
     if (alphaPhi.dimensions() == dimVolume/dimTime)
     {
-        for (label i = 0; i <= nCorr_; ++ i)
+        for (int i=0; i<=nCorr_; i++)
         {
             fvScalarMatrix fieldEqn
             (
@@ -437,7 +437,7 @@ bool Foam::functionObjects::phaseScalarTransport::execute()
         const volScalarField& rho =
             mesh_.lookupObject<volScalarField>(rhoName_);
 
-        for (label i = 0; i <= nCorr_; ++ i)
+        for (int i=0; i<=nCorr_; i++)
         {
             fvScalarMatrix fieldEqn
             (
diff --git a/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.H b/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.H
index 0b6b924482..263b8216b5 100644
--- a/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.H
+++ b/src/functionObjects/solvers/phaseScalarTransport/phaseScalarTransport.H
@@ -152,7 +152,7 @@ class phaseScalarTransport
         scalar alphaDt_;
 
         //- Number of corrector iterations (optional)
-        label nCorr_;
+        int nCorr_;
 
         //- Residual volume-fraction
         scalar residualAlpha_;
diff --git a/src/functionObjects/solvers/scalarTransport/scalarTransport.C b/src/functionObjects/solvers/scalarTransport/scalarTransport.C
index 214b5998a4..d8a2ec239c 100644
--- a/src/functionObjects/solvers/scalarTransport/scalarTransport.C
+++ b/src/functionObjects/solvers/scalarTransport/scalarTransport.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2012-2018 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2012-2019 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -189,7 +189,7 @@ bool Foam::functionObjects::scalarTransport::execute()
         const volScalarField& rho =
             mesh_.lookupObject<volScalarField>(rhoName_);
 
-        for (label i = 0; i <= nCorr_; i++)
+        for (int i=0; i<=nCorr_; i++)
         {
             fvScalarMatrix sEqn
             (
@@ -209,7 +209,7 @@ bool Foam::functionObjects::scalarTransport::execute()
     }
     else if (phi.dimensions() == dimVolume/dimTime)
     {
-        for (label i = 0; i <= nCorr_; i++)
+        for (int i=0; i<=nCorr_; i++)
         {
             fvScalarMatrix sEqn
             (
diff --git a/src/functionObjects/solvers/scalarTransport/scalarTransport.H b/src/functionObjects/solvers/scalarTransport/scalarTransport.H
index a1bd1faee2..f1f0535e0e 100644
--- a/src/functionObjects/solvers/scalarTransport/scalarTransport.H
+++ b/src/functionObjects/solvers/scalarTransport/scalarTransport.H
@@ -94,7 +94,7 @@ class scalarTransport
         scalar alphaDt_;
 
         //- Number of corrector iterations (optional)
-        label nCorr_;
+        int nCorr_;
 
         //- Name of field whose schemes are used (optional)
         word schemesField_;