diff --git a/include/boost/lexical_cast.hpp b/include/boost/lexical_cast.hpp
index 924d6ac..820e4d1 100644
--- a/include/boost/lexical_cast.hpp
+++ b/include/boost/lexical_cast.hpp
@@ -88,6 +88,7 @@ namespace boost
             typedef wchar_t type;
         };
 
+        #ifndef BOOST_NO_STD_WSTRING
         template<>
         struct stream_char<std::wstring>
         {
@@ -95,6 +96,8 @@ namespace boost
         };
         #endif
 
+        #endif
+
         template<typename TargetChar, typename SourceChar>
         struct widest_char
         {