diff --git a/src/finiteVolume/fields/fvPatchFields/basic/calculated/calculatedFvPatchField.H b/src/finiteVolume/fields/fvPatchFields/basic/calculated/calculatedFvPatchField.H
index 1afb39929c..d4b01de328 100644
--- a/src/finiteVolume/fields/fvPatchFields/basic/calculated/calculatedFvPatchField.H
+++ b/src/finiteVolume/fields/fvPatchFields/basic/calculated/calculatedFvPatchField.H
@@ -39,7 +39,7 @@ Description
     myPatch
     {
         type            calculated;
-        value           uniform (0 0 0);    // optional value entry
+        value           uniform (0 0 0);    // Required value entry
     }
     \endverbatim
 
@@ -89,7 +89,7 @@ public:
             const fvPatch&,
             const DimensionedField<Type, volMesh>&,
             const dictionary&,
-            const bool valueRequired=false
+            const bool valueRequired=true
         );
 
         //- Construct by mapping given patchField<Type> onto a new patch
diff --git a/tutorials/combustion/fireFoam/les/smallPoolFire2D/0/soot b/tutorials/combustion/fireFoam/les/smallPoolFire2D/0/soot
index cc500661a9..1ceda2d912 100644
--- a/tutorials/combustion/fireFoam/les/smallPoolFire2D/0/soot
+++ b/tutorials/combustion/fireFoam/les/smallPoolFire2D/0/soot
@@ -24,6 +24,7 @@ boundaryField
     ".*"
     {
         type            calculated;
+        value           $internalField;
     }
 
     frontAndBack