diff --git a/Nef_3/include/CGAL/Nef_3/SNC_decorator.h b/Nef_3/include/CGAL/Nef_3/SNC_decorator.h
index f03780a1fa6..61dcbb983ef 100644
--- a/Nef_3/include/CGAL/Nef_3/SNC_decorator.h
+++ b/Nef_3/include/CGAL/Nef_3/SNC_decorator.h
@@ -280,6 +280,7 @@ class SNC_decorator : public SNC_const_decorator<Map> {
     SFace_map linked;
     Shell_volume_setter(const SNCD_& Di)
       : D(Di), linked(false) {}
+    void reserve(Size_type n) { linked.reserve(n); }
     void visit(SFace_handle h) {
       CGAL_NEF_TRACEN(h->center_vertex()->point());
       D.set_volume(h, c);
diff --git a/Nef_3/include/CGAL/Nef_3/SNC_simplify.h b/Nef_3/include/CGAL/Nef_3/SNC_simplify.h
index 9e258323e5a..6518d75cc3c 100644
--- a/Nef_3/include/CGAL/Nef_3/SNC_simplify.h
+++ b/Nef_3/include/CGAL/Nef_3/SNC_simplify.h
@@ -651,6 +651,7 @@ class SNC_simplify_base : public SNC_decorator<SNC_structure> {
 
     SNC_decorator D(*this->sncp());
     Volume_setter setter(D);
+    setter.reserve(this->sncp()->number_of_sfaces());
 
     SFace_iterator sf;
     Volume_handle c;