diff --git a/src/thermophysicalModels/basicSolidThermo/isotropicKSolidThermo/isotropicKSolidThermo.H b/src/thermophysicalModels/basicSolidThermo/isotropicKSolidThermo/isotropicKSolidThermo.H
index e40f4d06c9..728ccca0c3 100644
--- a/src/thermophysicalModels/basicSolidThermo/isotropicKSolidThermo/isotropicKSolidThermo.H
+++ b/src/thermophysicalModels/basicSolidThermo/isotropicKSolidThermo/isotropicKSolidThermo.H
@@ -109,7 +109,7 @@ public:
             {
                 notImplemented
                 (
-                    "directionalKSolidThermo::directionalKappa(const label)
+                    "directionalKSolidThermo::directionalKappa(const label)"
                     "const"
                 );
                 return tmp<symmTensorField>(NULL);