diff --git a/Triangulation_2/include/CGAL/Triangulation_2/internal/Polyline_constraint_hierarchy_2.h b/Triangulation_2/include/CGAL/Triangulation_2/internal/Polyline_constraint_hierarchy_2.h
index 4580c1f3248..81d45f4d89e 100644
--- a/Triangulation_2/include/CGAL/Triangulation_2/internal/Polyline_constraint_hierarchy_2.h
+++ b/Triangulation_2/include/CGAL/Triangulation_2/internal/Polyline_constraint_hierarchy_2.h
@@ -347,8 +347,6 @@ public:
 
   // Query
   bool is_subconstrained_edge(T va, T vb) const;
-  bool is_constrained_edge(T va, T vb) const;
-  bool is_constrained_vertex(T v) const;
 
   Vertex_it vertices_in_constraint_begin(Constraint_id cid) const
   { return cid.begin(); }