diff --git a/scoped_ptr_example.hpp b/scoped_ptr_example.hpp
index c4b6bf5..d3009f7 100644
--- a/scoped_ptr_example.hpp
+++ b/scoped_ptr_example.hpp
@@ -9,7 +9,7 @@
 //  is complete where it counts - in the inplementation translation unit where
 //  destruction is actually instantiated.
 
-class example : boost::noncopyable
+class example : private boost::noncopyable
 {
  public:
   example();