diff --git a/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.C b/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.C
index 29852a42f8..3e28db3090 100644
--- a/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.C
+++ b/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.C
@@ -154,14 +154,15 @@ Foam::tmp<Foam::volScalarField> Foam::pressureTools::pDyn
 
 Foam::tmp<Foam::volScalarField> Foam::pressureTools::convertToCoeff
 (
-    const volScalarField& p
+    const volScalarField& pCalculated,
+    const volScalarField& pIn
 ) const
 {
-    tmp<volScalarField> tCoeff(p);
+    tmp<volScalarField> tCoeff(pCalculated);
 
     if (calcCoeff_)
     {
-        tCoeff() /= pDyn(p);
+        tCoeff() /= pDyn(pIn) + dimensionedScalar("p0", dimPressure, SMALL);
     }
 
     return tCoeff;
@@ -271,7 +272,7 @@ void Foam::pressureTools::write()
                 obr_,
                 IOobject::NO_READ
             ),
-            convertToCoeff(rhoScale(p)*p + pDyn(p) + pRef())
+            convertToCoeff(rhoScale(p)*p + pDyn(p) + pRef(), p)
         );
 
         pResult.write();
diff --git a/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.H b/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.H
index 71784edf1d..f823c8faea 100644
--- a/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.H
+++ b/src/postProcessing/functionObjects/utilities/pressureTools/pressureTools.H
@@ -153,7 +153,11 @@ class pressureTools
         tmp<volScalarField> pDyn(const volScalarField& p) const;
 
         //- Convert to coeff data by applying the pDyn scaling
-        tmp<volScalarField> convertToCoeff(const volScalarField& p) const;
+        tmp<volScalarField> convertToCoeff
+        (
+            const volScalarField& pCalculated,
+            const volScalarField& pIn
+        ) const;
 
         //- Disallow default bitwise copy construct
         pressureTools(const pressureTools&);