diff --git a/headers/posix/wchar.h b/headers/posix/wchar.h
index 25c340ccc9..a3413186c6 100644
--- a/headers/posix/wchar.h
+++ b/headers/posix/wchar.h
@@ -19,7 +19,18 @@ typedef struct {
 
 #include <size_t.h>
 
+size_t 	mbrlen(const char *s, size_t n, mbstate_t *ps);
+size_t 	mbrtowc(wchar_t *pwc, const char *s, size_t n, mbstate_t *ps);
+size_t	mbsrtowcs(wchar_t *dst, const char **src, size_t len, 
+			mbstate_t *ps);
 int		mbsinit(const mbstate_t *);
 size_t	wcrtomb(char *, wchar_t, mbstate_t *);
+wchar_t	*wcschr(const wchar_t *ws, wchar_t wc);
+int 	wcscmp(const wchar_t *ws1, const wchar_t *ws2);
+int 	wcscoll(const wchar_t *ws1, const wchar_t *ws2);
+size_t	wcsrtombs(char *dst, const wchar_t **src, size_t len,
+			mbstate_t *ps);
+
+#define WEOF ((wint_t)(-1))
 
 #endif /* _WCHAR_H */