diff --git a/src/thermophysicalModels/chemistryModel/chemistryModel/TDACChemistryModel/TDACChemistryModel.C b/src/thermophysicalModels/chemistryModel/chemistryModel/TDACChemistryModel/TDACChemistryModel.C
index bc6c6ee749c48d24dff8e8f8b416ba2759282298..8d9f0ccb6054ab1ad58d1673f70568204c04dc99 100644
--- a/src/thermophysicalModels/chemistryModel/chemistryModel/TDACChemistryModel/TDACChemistryModel.C
+++ b/src/thermophysicalModels/chemistryModel/chemistryModel/TDACChemistryModel/TDACChemistryModel.C
@@ -61,7 +61,7 @@ Foam::TDACChemistryModel<CompType, ThermoType>::TDACChemistryModel
             IOobject::AUTO_WRITE
         ),
         mesh,
-        scalar(0)
+        dimensionedScalar("0", dimless, 0)
     )
 {
     basicMultiComponentMixture& composition = this->thermo().composition();