diff --git a/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h b/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
index a3b6d1f7eaf..571892f2a8c 100644
--- a/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
+++ b/Triangulation_2/include/CGAL/Constrained_Delaunay_triangulation_2.h
@@ -33,8 +33,6 @@
 #include <boost/iterator/zip_iterator.hpp>
 #include <boost/mpl/and.hpp>
 
-#include <boost/iterator/counting_iterator.hpp>
-
 namespace CGAL {
 
 namespace internal{
diff --git a/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h b/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
index d48d45974b4..f8d54c346f5 100644
--- a/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
+++ b/Triangulation_2/include/CGAL/Triangulation_2/insert_constraints.h
@@ -2,6 +2,9 @@
 #define CGAL_INTERNAL_TRIANGULATION_2_IMSERT_CONSTRAINTS_H
 
 #include <CGAL/Spatial_sort_traits_adapter_2.h>
+#include <boost/iterator/counting_iterator.hpp>
+#include <vector>
+#include <iterator>
 
 namespace CGAL {
   namespace internal {