diff --git a/include/cxx/cwchar b/include/cxx/cwchar
index 52ced526991..b33b0477b8c 100755
--- a/include/cxx/cwchar
+++ b/include/cxx/cwchar
@@ -41,6 +41,7 @@
 //***************************************************************************
 
 #include <wchar.h>
+#include <stdlib.h>
 
 //***************************************************************************
 // Namespace
@@ -79,6 +80,7 @@ namespace std
   using ::mbrlen;
   using ::mbrtowc;
   using ::mbsrtowcs;
+  using ::mbtowc;
   using ::putwc;
   using ::putwchar;
   using ::swprintf;
@@ -116,6 +118,7 @@ namespace std
   using ::wcswidth;
   using ::wcsxfrm;
   using ::wctob;
+  using ::wctomb;
   using ::wctype;
   using ::wcwidth;
   using ::wmemchr;