diff --git a/src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.C b/src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.C
index 2593c7ad1a..92309507c1 100644
--- a/src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.C
+++ b/src/finiteVolume/fields/fvPatchFields/derived/activeBaffleVelocity/activeBaffleVelocityFvPatchVectorField.C
@@ -249,7 +249,7 @@ void Foam::activeBaffleVelocityFvPatchVectorField::updateCoeffs()
                 min
                 (
                     openFraction_
-                  + max
+                  + min
                     (
                         this->db().time().deltaTValue()/openingTime_,
                         maxOpenFractionDelta_