diff --git a/src/thermophysicalModels/reactionThermo/chemistryReaders/chemistryReader/makeChemistryReaders.C b/src/thermophysicalModels/reactionThermo/chemistryReaders/chemistryReader/makeChemistryReaders.C
index 70801f562a..faab787df6 100644
--- a/src/thermophysicalModels/reactionThermo/chemistryReaders/chemistryReader/makeChemistryReaders.C
+++ b/src/thermophysicalModels/reactionThermo/chemistryReaders/chemistryReader/makeChemistryReaders.C
@@ -36,6 +36,7 @@ namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+makeChemistryReader(constGasThermoPhysics);
 makeChemistryReader(gasThermoPhysics);
 makeChemistryReader(icoPoly8ThermoPhysics);