diff --git a/include/cxx/cwchar b/include/cxx/cwchar
index 3ca4c6c1d87..167f5982ef5 100755
--- a/include/cxx/cwchar
+++ b/include/cxx/cwchar
@@ -91,6 +91,7 @@ namespace std
   using ::vfwprintf;
   using ::vwprintf;
   using ::vswprintf;
+  using ::wcstold;
   using ::wcrtomb;
   using ::wcscat;
   using ::wcschr;