diff --git a/src/lagrangian/intermediate/submodels/Kinematic/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C b/src/lagrangian/intermediate/submodels/Kinematic/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
index 7eb6e8cfee..0732e5004e 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/SurfaceFilmModel/SurfaceFilmModel/SurfaceFilmModel.C
@@ -238,7 +238,7 @@ void Foam::SurfaceFilmModel<CloudType>::cacheFilmFields
 
     diameterParcelPatch_ =
         filmModel.cloudDiameterTrans().boundaryField()[filmPatchI];
-    filmModel.toPrimary(filmPatchI, diameterParcelPatch_, maxOp<scalar>());
+    filmModel.toPrimary(filmPatchI, diameterParcelPatch_, maxEqOp<scalar>());
 
     UFilmPatch_ = filmModel.Us().boundaryField()[filmPatchI];
     filmModel.toPrimary(filmPatchI, UFilmPatch_);