diff --git a/src/thermophysicalModels/specie/thermo/thermo/EtoHthermo.H b/src/thermophysicalModels/specie/thermo/thermo/EtoHthermo.H
index 190c97d407..8ff174df78 100644
--- a/src/thermophysicalModels/specie/thermo/thermo/EtoHthermo.H
+++ b/src/thermophysicalModels/specie/thermo/thermo/EtoHthermo.H
@@ -24,5 +24,5 @@ inline scalar Ha
     const scalar T
 ) const
 {
-    return Es(p, T) + p/EquationOfState::rho(p, T);
+    return Ea(p, T) + p/EquationOfState::rho(p, T);
 }