diff --git a/include/boost/algorithm/string/formatter.hpp b/include/boost/algorithm/string/formatter.hpp
index 78325a4..de8681b 100644
--- a/include/boost/algorithm/string/formatter.hpp
+++ b/include/boost/algorithm/string/formatter.hpp
@@ -83,7 +83,7 @@ namespace boost {
         template<typename RangeT>
         inline detail::empty_formatF< 
             BOOST_STRING_TYPENAME range_value<RangeT>::type>
-        empty_formatter(const RangeT& Input)
+        empty_formatter(const RangeT&)
         {
             return detail::empty_formatF<
                 BOOST_STRING_TYPENAME range_value<RangeT>::type>();