diff --git a/source/blender/blenkernel/BKE_mesh.h b/source/blender/blenkernel/BKE_mesh.h
index fceaddf82a3..4e468f10c0f 100644
--- a/source/blender/blenkernel/BKE_mesh.h
+++ b/source/blender/blenkernel/BKE_mesh.h
@@ -469,7 +469,7 @@ void BKE_mesh_calc_normals_split(struct Mesh *mesh);
  * That data, among other things, contains 'smooth fan' info, useful e.g.
  * to split geometry along sharp edges.
  */
-void BKE_mesh_calc_normals_split_ex(struct Mesh *mesh,
+void BKE_mesh_calc_normals_split_ex(const struct Mesh *mesh,
                                     struct MLoopNorSpaceArray *r_lnors_spacearr,
                                     float (*r_corner_normals)[3]);
 
diff --git a/source/blender/blenkernel/intern/mesh.cc b/source/blender/blenkernel/intern/mesh.cc
index 9eb3647ccc7..5a43cb096cb 100644
--- a/source/blender/blenkernel/intern/mesh.cc
+++ b/source/blender/blenkernel/intern/mesh.cc
@@ -1778,7 +1778,7 @@ static float (*ensure_corner_normal_layer(Mesh &mesh))[3]
   return r_loop_normals;
 }
 
-void BKE_mesh_calc_normals_split_ex(Mesh *mesh,
+void BKE_mesh_calc_normals_split_ex(const Mesh *mesh,
                                     MLoopNorSpaceArray *r_lnors_spacearr,
                                     float (*r_corner_normals)[3])
 {
diff --git a/source/blender/nodes/geometry/nodes/node_geo_distribute_points_on_faces.cc b/source/blender/nodes/geometry/nodes/node_geo_distribute_points_on_faces.cc
index a0c8d2e2f97..9c9569a4691 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_distribute_points_on_faces.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_distribute_points_on_faces.cc
@@ -336,7 +336,7 @@ static void compute_normal_outputs(const Mesh &mesh,
 {
   Array<float3> corner_normals(mesh.totloop);
   BKE_mesh_calc_normals_split_ex(
-      const_cast<Mesh *>(&mesh), nullptr, reinterpret_cast<float(*)[3]>(corner_normals.data()));
+      &mesh, nullptr, reinterpret_cast<float(*)[3]>(corner_normals.data()));
 
   const Span<MLoopTri> looptris = mesh.looptris();
   threading::parallel_for(bary_coords.index_range(), 512, [&](const IndexRange range) {