diff --git a/src/schemes/fluid/surface_normal_sph.jl b/src/schemes/fluid/surface_normal_sph.jl
index 9d6e5ab4d..b07c57b1f 100644
--- a/src/schemes/fluid/surface_normal_sph.jl
+++ b/src/schemes/fluid/surface_normal_sph.jl
@@ -88,7 +88,7 @@ function calc_normal!(system::FluidSystem, neighbor_system::BoundarySystem, u_sy
     foreach_point_neighbor(neighbor_system, system, neighbor_system_coords, system_coords,
                            nhs,
                            points=eachparticle(neighbor_system)) do particle, neighbor,
-                                                                       pos_diff, distance
+                                                                    pos_diff, distance
         colorfield[particle] += hydrodynamic_mass(system, neighbor) /
                                 particle_density(v, system, neighbor) * system.color *
                                 smoothing_kernel(system, distance)