diff --git a/src/lagrangian/dsmc/submodels/InflowBoundaryModel/FreeStream/FreeStream.C b/src/lagrangian/dsmc/submodels/InflowBoundaryModel/FreeStream/FreeStream.C
index aed19d9d61..b8818aa9cd 100644
--- a/src/lagrangian/dsmc/submodels/InflowBoundaryModel/FreeStream/FreeStream.C
+++ b/src/lagrangian/dsmc/submodels/InflowBoundaryModel/FreeStream/FreeStream.C
@@ -220,6 +220,7 @@ void Foam::FreeStream<CloudType>::inflow()
 
             // Cumulative triangle area fractions
             List<scalar> cTriAFracs(nVertices);
+            cTriAFracs[0] = 0.0;
 
             for (label v = 0; v < nVertices - 1; v++)
             {