diff --git a/Convex_decomposition_3/include/CGAL/Convex_decomposition_3/External_structure_builder.h b/Convex_decomposition_3/include/CGAL/Convex_decomposition_3/External_structure_builder.h
index f43609baafd..c6ecee86c0b 100644
--- a/Convex_decomposition_3/include/CGAL/Convex_decomposition_3/External_structure_builder.h
+++ b/Convex_decomposition_3/include/CGAL/Convex_decomposition_3/External_structure_builder.h
@@ -76,8 +76,6 @@ class External_structure_builder : public Modifier_base<typename Nef_::SNC_and_P
 
     SNC_structure* sncp(sncpl.sncp);
     SNC_point_locator* pl(sncpl.pl);
-
-    Unique_hash_map<SHalfedge_handle, SFace_handle> sedge2sface;
     SNC_point_locator* old_pl = pl;
     pl = pl->clone();
     sncpl.pl = pl;