diff --git a/src/thermophysicalModels/reactionThermo/chemistryReaders/chemkinReader/chemkinReader.C b/src/thermophysicalModels/reactionThermo/chemistryReaders/chemkinReader/chemkinReader.C
index b69fe5aaa..bdaa6471d 100644
--- a/src/thermophysicalModels/reactionThermo/chemistryReaders/chemkinReader/chemkinReader.C
+++ b/src/thermophysicalModels/reactionThermo/chemistryReaders/chemkinReader/chemkinReader.C
@@ -392,7 +392,7 @@ void Foam::chemkinReader::addPressureDependentReaction
 
         default:
         {
-            if (fofType < 4)
+            if (fofType < unknownFallOffFunctionType)
             {
                 FatalErrorIn("chemkinReader::addPressureDependentReaction")
                     << "Fall-off function type "