Index: boost/test/test_tools.hpp
===================================================================
--- boost/test/test_tools.hpp	(revision 47067)
+++ boost/test/test_tools.hpp	(working copy)
@@ -358,7 +358,7 @@
 namespace boost { namespace test_tools { namespace tt_detail {      \
 template<>                                                          \
 struct print_log_value<the_type > {                                 \
-    void operator()( std::ostream& ostr, the_type const& t ) {}     \
+    void operator()( std::ostream&, the_type const&) {}             \
 };                                                                  \
 }}}                                                                 \
 /**/