diff --git a/src/tuple.cpp b/src/tuple.cpp
index 94f0ccc..85ed977 100644
--- a/src/tuple.cpp
+++ b/src/tuple.cpp
@@ -22,12 +22,13 @@
 #include "boost/tuple/tuple_io.hpp"
 
 namespace boost {
-namespace detail {
 namespace tuples {
+namespace detail {
+   
 const int
  format_info::stream_index[number_of_manipulators] 
    = { std::ios::xalloc(), std::ios::xalloc(), std::ios::xalloc() };
    
-} // namespace tuples   
 } // namespace detail
+} // namespace tuples   
 } // namespace boost