diff --git a/src/lagrangian/parcel/submodels/Momentum/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C b/src/lagrangian/parcel/submodels/Momentum/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
index 0f57ab7b3..e5a3e35d6 100644
--- a/src/lagrangian/parcel/submodels/Momentum/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
+++ b/src/lagrangian/parcel/submodels/Momentum/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
@@ -41,7 +41,7 @@ Foam::SurfaceFilmModel<CloudType>::SurfaceFilmModel(CloudType& owner)
     diameterParcelPatch_(0),
     UFilmPatch_(0),
     rhoFilmPatch_(0),
-    deltaFilmPatch_(0),
+    deltaFilmPatch_(owner.mesh().boundary().size()),
     nParcelsTransferred_(0),
     nParcelsInjected_(0)
 {}