diff --git a/include/boost/python/stl_iterator.hpp b/include/boost/python/stl_iterator.hpp
index 87456d1f..83895487 100755
--- a/include/boost/python/stl_iterator.hpp
+++ b/include/boost/python/stl_iterator.hpp
@@ -36,7 +36,7 @@ struct stl_input_iterator
     }
 
 private:
-    friend class iterator_core_access;
+    friend class boost::iterator_core_access;
 
     void increment()
     {