diff --git a/Mesh_2/include/CGAL/IO/vtk_io_2.h b/Mesh_2/include/CGAL/IO/vtk_io_2.h
index 3544142f13f..59b2d5f1ee9 100644
--- a/Mesh_2/include/CGAL/IO/vtk_io_2.h
+++ b/Mesh_2/include/CGAL/IO/vtk_io_2.h
@@ -27,6 +27,9 @@
 #include <fstream>
 #include <vector>
 
+#include <CGAL/license/Mesh_2.h>
+
+
 //todo try to factorize with functors
 namespace CGAL{
 // writes the appended data into the .vtu file
diff --git a/Mesh_3/include/CGAL/IO/vtk_io.h b/Mesh_3/include/CGAL/IO/vtk_io.h
index 969a9a20be2..c062294419c 100644
--- a/Mesh_3/include/CGAL/IO/vtk_io.h
+++ b/Mesh_3/include/CGAL/IO/vtk_io.h
@@ -23,6 +23,9 @@
 #ifndef CGAL_VTK_IO_H
 #define CGAL_VTK_IO_H
 
+#include <CGAL/license/Mesh_3.h>
+
+
 #include <fstream>
 #include <vector>