diff --git a/src/finiteVolume/fields/fvPatchFields/derived/supersonicFreestream/supersonicFreestreamFvPatchVectorField.C b/src/finiteVolume/fields/fvPatchFields/derived/supersonicFreestream/supersonicFreestreamFvPatchVectorField.C
index 32c9fc4264..d60c76af4e 100644
--- a/src/finiteVolume/fields/fvPatchFields/derived/supersonicFreestream/supersonicFreestreamFvPatchVectorField.C
+++ b/src/finiteVolume/fields/fvPatchFields/derived/supersonicFreestream/supersonicFreestreamFvPatchVectorField.C
@@ -158,7 +158,7 @@ void Foam::supersonicFreestreamFvPatchVectorField::updateCoeffs()
         patch().lookupPatchField<volScalarField, scalar>("p");
 
     const fvPatchField<scalar>& ppsi =
-        patch().lookupPatchField<volScalarField, scalar>("psi");
+        patch().lookupPatchField<volScalarField, scalar>("thermo:psi");
 
     // Need R of the free-stream flow.  Assume R is independent of location
     // along patch so use face 0