diff --git a/include/boost/detail/utf8_codecvt_facet.hpp b/include/boost/detail/utf8_codecvt_facet.hpp
index e167c98..b777ff9 100644
--- a/include/boost/detail/utf8_codecvt_facet.hpp
+++ b/include/boost/detail/utf8_codecvt_facet.hpp
@@ -87,7 +87,6 @@
 
 #if defined(BOOST_NO_STDC_NAMESPACE)
 namespace std {
-    using ::codecvt;
     using ::mbstate_t;
     using ::size_t;
 }