diff --git a/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h b/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
index ca079337dd5..752b86fc293 100644
--- a/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
+++ b/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
@@ -23,7 +23,6 @@
 
 #include <CGAL/triangulation_assertions.h>
 #include <CGAL/Constrained_triangulation_2.h>
-#include <CGAL/Constrained_voronoi_diagram_2.h>
 #include <CGAL/Triangulation_2/insert_constraints.h>
 
 #ifndef CGAL_TRIANGULATION_2_DONT_INSERT_RANGE_OF_POINTS_WITH_INFO