diff --git a/Nef_S2/include/CGAL/Nef_S2/SM_overlayer.h b/Nef_S2/include/CGAL/Nef_S2/SM_overlayer.h
index cbab1c3061f..015694b691c 100644
--- a/Nef_S2/include/CGAL/Nef_S2/SM_overlayer.h
+++ b/Nef_S2/include/CGAL/Nef_S2/SM_overlayer.h
@@ -1109,6 +1109,7 @@ void SM_overlayer<Map>::
 set_outer_face_mark(int offset, const std::vector<Mark>& mohs) {
 
   SFace_handle sf = this->new_sface();
+  assoc_info(sf);
   mark(sf, 0) = mohs[offset];
   mark(sf, 1) = mohs[offset+2];