diff --git a/noncopyable_test.cpp b/noncopyable_test.cpp
index 6ff951d..9986401 100644
--- a/noncopyable_test.cpp
+++ b/noncopyable_test.cpp
@@ -20,7 +20,7 @@
 
 namespace
 {
-    class DontTreadOnMe : boost::noncopyable
+    class DontTreadOnMe : private boost::noncopyable
     {
     public:
          DontTreadOnMe() { std::cout << "defanged!" << std::endl; }