diff --git a/Packages/Min_sphere_of_spheres_d/include/CGAL/Min_sphere_of_spheres_d.h b/Packages/Min_sphere_of_spheres_d/include/CGAL/Min_sphere_of_spheres_d.h
index 142a87cd769..81eec4ad0c3 100644
--- a/Packages/Min_sphere_of_spheres_d/include/CGAL/Min_sphere_of_spheres_d.h
+++ b/Packages/Min_sphere_of_spheres_d/include/CGAL/Min_sphere_of_spheres_d.h
@@ -55,7 +55,6 @@
 #include <cassert>
 #include <cstdlib>                 // for std::rand()
 #include <cmath>
-#include <cstddef>                 // for std::size_t, std::ptrdiff_t
 #include <vector>
 #include <iostream>
 #include <CGAL/Min_sphere_of_spheres_d_support_set.h>