diff --git a/include/boost/iostreams/detail/translate_int_type.hpp b/include/boost/iostreams/detail/translate_int_type.hpp
index 258f6b0..a5062d3 100755
--- a/include/boost/iostreams/detail/translate_int_type.hpp
+++ b/include/boost/iostreams/detail/translate_int_type.hpp
@@ -11,9 +11,6 @@
 # pragma once
 #endif              
 
-#include <string>              // char_traits.
-#include <utility>             // pair.
-#include <boost/optional.hpp>
 #include <boost/type_traits/is_same.hpp>
 
 namespace boost { namespace iostreams { namespace detail {