diff --git a/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.C b/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.C
index 60f1019f8781a95e31b83b74cba62a3f202ab7dc..3fca0e81359a46f3dbaf13830d967e765d13012c 100644
--- a/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.C
+++ b/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.C
@@ -489,13 +489,13 @@ void Foam::ReactingParcel<ParcelType>::calcPhaseChange
     // Limit phase change mass by availability of each specie
     dMassPC = min(mass*YPhase*YComponents, dMassPC);
 
-    scalar dMassTot = sum(dMassPC);
+    const scalar dMassTot = sum(dMassPC);
 
     // Add to cumulative phase change mass
     td.cloud().addToMassPhaseChange(this->nParticle_*dMassTot);
 
     // Average molecular weight of carrier mix - assumes perfect gas
-    scalar Wc = this->rhoc_*specie::RR*this->Tc_/this->pc_;
+    const scalar Wc = this->rhoc_*specie::RR*this->Tc_/this->pc_;
 
     forAll(YComponents, i)
     {