diff --git a/test/io_test.cpp b/test/io_test.cpp
index 382f8cc..69957d3 100644
--- a/test/io_test.cpp
+++ b/test/io_test.cpp
@@ -20,7 +20,7 @@
 #include <iterator>
 #include <algorithm>
 #include <string>
-#include <iomanip>
+#include <boost/detail/iomanip.hpp>
 
 #if defined BOOST_NO_STRINGSTREAM
 #include <strstream>
@@ -81,7 +81,7 @@ int test_main(int argc, char * argv[] ) {
   
   // check width
   useThisOStringStream os4;
-  os4 << std::setw(10) << make_tuple(1, 2, 3);
+  os4 << boost::detail::setw(10) << make_tuple(1, 2, 3);
   BOOST_CHECK (os4.str() == std::string("   (1 2 3)") );
 
   std::ofstream tmp("temp.tmp");