diff --git a/tutorials/compressible/sonicFoam/RAS/nacaAirfoil/0/p b/tutorials/compressible/sonicFoam/RAS/nacaAirfoil/0/p
index 398442fa78..406c937d7b 100644
--- a/tutorials/compressible/sonicFoam/RAS/nacaAirfoil/0/p
+++ b/tutorials/compressible/sonicFoam/RAS/nacaAirfoil/0/p
@@ -32,7 +32,7 @@ boundaryField
         type            waveTransmissive;
         field           p;
         psi             thermo:psi;
-        gamma           1.3;
+        gamma           1.4;
         fieldInf        $pressure;
         lInf            1;
         value           $internalField;