diff --git a/src/functionObjects/field/specieFlux/specieFlux.C b/src/functionObjects/field/specieFlux/specieFlux.C
index c893e64a99..2f6017881e 100644
--- a/src/functionObjects/field/specieFlux/specieFlux.C
+++ b/src/functionObjects/field/specieFlux/specieFlux.C
@@ -80,7 +80,7 @@ bool Foam::functionObjects::specieFluxBase::calc()
     const fluidThermophysicalTransportModel& ttm =
         lookupObject<fluidThermophysicalTransportModel>(ttmName);
 
-    const volScalarField& Yi = thermo.Y(fieldName_);
+    const volScalarField& Yi = thermo.Y(IOobject::member(fieldName_));
 
     store(resultName_, calc(ttm, Yi));