diff --git a/Bounding_volumes/include/CGAL/Min_sphere_of_points_d_traits_3.h b/Bounding_volumes/include/CGAL/Min_sphere_of_points_d_traits_3.h
index 831060262eb..f92b20db158 100644
--- a/Bounding_volumes/include/CGAL/Min_sphere_of_points_d_traits_3.h
+++ b/Bounding_volumes/include/CGAL/Min_sphere_of_points_d_traits_3.h
@@ -41,7 +41,7 @@ namespace CGAL {
     static const int D = 3;                  // dimension
 
   public: // accessors:
-    static inline const FT radius(const Sphere& s) {
+    static inline const FT radius(const Sphere& /*s*/) {
       return 0;
     }