diff --git a/tutorials/compressible/sonicFoam/ras/nacaAirfoil/0/p b/tutorials/compressible/sonicFoam/ras/nacaAirfoil/0/p
index 4628c438e8696a083cba22f17347f47680458334..846f03a390f09795ca44e94ab170b883f30f3c97 100644
--- a/tutorials/compressible/sonicFoam/ras/nacaAirfoil/0/p
+++ b/tutorials/compressible/sonicFoam/ras/nacaAirfoil/0/p
@@ -31,7 +31,7 @@ boundaryField
         field           p;
         phi             phi;
         rho             rho;
-        psi             psi;
+        psi             thermo:psi;
         gamma           1.3;
         fieldInf        100000;
         lInf            1;