diff --git a/Advancing_front_surface_reconstruction/include/CGAL/Advancing_front_surface_reconstruction.h b/Advancing_front_surface_reconstruction/include/CGAL/Advancing_front_surface_reconstruction.h
index b349169c6b7..8f0c7d85544 100644
--- a/Advancing_front_surface_reconstruction/include/CGAL/Advancing_front_surface_reconstruction.h
+++ b/Advancing_front_surface_reconstruction/include/CGAL/Advancing_front_surface_reconstruction.h
@@ -746,7 +746,7 @@ namespace CGAL {
     void run(double radius_ratio_bound=5, double beta= 0.52)
     {
       K = radius_ratio_bound;
-      COS_BETA = acos(beta);
+      COS_BETA = cos(beta);
       if(T.dimension() < 3){
         return;
       }