diff --git a/simgear/scene/model/BVHPageNodeOSG.cxx b/simgear/scene/model/BVHPageNodeOSG.cxx
index b68f56e1..412fedd5 100644
--- a/simgear/scene/model/BVHPageNodeOSG.cxx
+++ b/simgear/scene/model/BVHPageNodeOSG.cxx
@@ -591,6 +591,7 @@ public:
         return _pageNode.get();
     }
 
+private:
     SGSharedPtr<BVHPageNodeOSG> _pageNode;
     std::vector<SGSharedPtr<BVHNode> > _nodeVector;
 };