diff --git a/include/boost/geometry/index/detail/rtree/visitors/insert.hpp b/include/boost/geometry/index/detail/rtree/visitors/insert.hpp
index 2d324cb7f..5709a930c 100644
--- a/include/boost/geometry/index/detail/rtree/visitors/insert.hpp
+++ b/include/boost/geometry/index/detail/rtree/visitors/insert.hpp
@@ -265,7 +265,7 @@ struct insert_traverse_data
 // Default insert visitor
 template <typename Element, typename MembersHolder>
 class insert
-    : MembersHolder::visitor
+    : public MembersHolder::visitor
 {
 protected:
     typedef typename MembersHolder::box_type box_type;