diff --git a/src/thermophysicalModels/laminarFlameSpeed/Gulders/Gulders.C b/src/thermophysicalModels/laminarFlameSpeed/Gulders/Gulders.C
index 27443c98ee..7655455a73 100644
--- a/src/thermophysicalModels/laminarFlameSpeed/Gulders/Gulders.C
+++ b/src/thermophysicalModels/laminarFlameSpeed/Gulders/Gulders.C
@@ -218,7 +218,7 @@ Foam::laminarFlameSpeedModels::Gulders::operator()() const
             dimensionedScalar
             (
                 hhuCombustionThermo_.lookup("stoichiometricAirFuelMassRatio")
-            )*ft/(scalar(1) - ft)
+            )*ft/((1 + SMALL) - ft)
         );
     }
     else