diff --git a/src/thermophysicalModels/specie/reaction/Reactions/ReversibleReaction/ReversibleReaction.C b/src/thermophysicalModels/specie/reaction/Reactions/ReversibleReaction/ReversibleReaction.C
index 4ec61e8e5f..fb62950ff5 100644
--- a/src/thermophysicalModels/specie/reaction/Reactions/ReversibleReaction/ReversibleReaction.C
+++ b/src/thermophysicalModels/specie/reaction/Reactions/ReversibleReaction/ReversibleReaction.C
@@ -146,7 +146,7 @@ Foam::scalar Foam::ReversibleReaction
 {
     scalar Kc = this->Kc(p, T);
 
-    if (mag(Kc > VSMALL))
+    if (mag(Kc) > VSMALL)
     {
         return kfwd/Kc;
     }