diff --git a/mingw-w64-headers/crt/ctype.h b/mingw-w64-headers/crt/ctype.h
index 9b71a13..d6a1a54 100644
--- a/mingw-w64-headers/crt/ctype.h
+++ b/mingw-w64-headers/crt/ctype.h
@@ -180,11 +180,13 @@
   wint_t __cdecl towlower(wint_t _C);
   _CRTIMP wint_t __cdecl _towlower_l(wint_t _C,_locale_t _Locale);
   int __cdecl iswctype(wint_t _C,wctype_t _Type);
+#if __MSVCRT_VERSION__ >= 0x800
   _CRTIMP int __cdecl _iswctype_l(wint_t _C,wctype_t _Type,_locale_t _Locale);
   _CRTIMP int __cdecl __iswcsymf(wint_t _C);
   _CRTIMP int __cdecl _iswcsymf_l(wint_t _C,_locale_t _Locale);
   _CRTIMP int __cdecl __iswcsym(wint_t _C);
   _CRTIMP int __cdecl _iswcsym_l(wint_t _C,_locale_t _Locale);
+#endif
 #ifdef _CRT_USE_WINAPI_FAMILY_DESKTOP_APP
   int __cdecl is_wctype(wint_t _C,wctype_t _Type);
 #endif /* _CRT_USE_WINAPI_FAMILY_DESKTOP_APP */
diff --git a/mingw-w64-headers/crt/wchar.h b/mingw-w64-headers/crt/wchar.h
index 73adadb..e466b52 100644
--- a/mingw-w64-headers/crt/wchar.h
+++ b/mingw-w64-headers/crt/wchar.h
@@ -270,11 +270,13 @@
   wint_t __cdecl towlower(wint_t _C);
   _CRTIMP wint_t __cdecl _towlower_l(wint_t _C,_locale_t _Locale);
   int __cdecl iswctype(wint_t _C,wctype_t _Type);
+#if __MSVCRT_VERSION__ >= 0x800
   _CRTIMP int __cdecl _iswctype_l(wint_t _C,wctype_t _Type,_locale_t _Locale);
   _CRTIMP int __cdecl __iswcsymf(wint_t _C);
   _CRTIMP int __cdecl _iswcsymf_l(wint_t _C,_locale_t _Locale);
   _CRTIMP int __cdecl __iswcsym(wint_t _C);
   _CRTIMP int __cdecl _iswcsym_l(wint_t _C,_locale_t _Locale);
+#endif
 #ifdef _CRT_USE_WINAPI_FAMILY_DESKTOP_APP
   int __cdecl is_wctype(wint_t _C,wctype_t _Type);
 #endif /* _CRT_USE_WINAPI_FAMILY_DESKTOP_APP */
diff --git a/mingw-w64-headers/crt/wctype.h b/mingw-w64-headers/crt/wctype.h
index 57f6ed5..6ea012d 100644
--- a/mingw-w64-headers/crt/wctype.h
+++ b/mingw-w64-headers/crt/wctype.h
@@ -128,8 +128,10 @@
   wint_t __cdecl towupper(wint_t);
   wint_t __cdecl towlower(wint_t);
   int __cdecl iswctype(wint_t,wctype_t);
+#if __MSVCRT_VERSION__ >= 0x800
   _CRTIMP int __cdecl __iswcsymf(wint_t);
   _CRTIMP int __cdecl __iswcsym(wint_t);
+#endif
   int __cdecl is_wctype(wint_t,wctype_t);
 #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || !defined (NO_OLDNAMES) || defined (__cplusplus)
 int __cdecl iswblank(wint_t _C);