diff --git a/applications/utilities/postProcessing/wall/solidWallHeatFlux/createFields.H b/applications/utilities/postProcessing/wall/solidWallHeatFlux/createFields.H
index 712dd510508d71650a945138d6667d0798f18b90..88adcd8e542840fa7082e472bb5e279702ef0656 100644
--- a/applications/utilities/postProcessing/wall/solidWallHeatFlux/createFields.H
+++ b/applications/utilities/postProcessing/wall/solidWallHeatFlux/createFields.H
@@ -3,4 +3,4 @@ autoPtr<solidThermo> thermo
     solidThermo::New(mesh)
 );
 
-volScalarField& T = thermo->T();
+const volScalarField& T = thermo->T();