diff --git a/mingw-w64-headers/crt/sec_api/stdlib_s.h b/mingw-w64-headers/crt/sec_api/stdlib_s.h
index 02117b4..4df3ba4 100644
--- a/mingw-w64-headers/crt/sec_api/stdlib_s.h
+++ b/mingw-w64-headers/crt/sec_api/stdlib_s.h
@@ -23,7 +23,9 @@
   _CRTIMP errno_t __cdecl _ultoa_s(unsigned long _Val,char *_DstBuf,size_t _Size,int _Radix);
   _CRTIMP errno_t __cdecl _wctomb_s_l(int *_SizeConverted,char *_MbCh,size_t _SizeInBytes,wchar_t _WCh,_locale_t _Locale);
   _CRTIMP errno_t __cdecl wcstombs_s(size_t *_PtNumOfCharConverted,char *_Dst,size_t _DstSizeInBytes,const wchar_t *_Src,size_t _MaxCountInBytes);
+  __DEFINE_CPP_OVERLOAD_SECURE_FUNC_1_2(errno_t, wcstombs_s, size_t*, _PtNumOfCharConverted, char, _Dst, const wchar_t*, _Src, size_t, _MaxCountInBytes)
   _CRTIMP errno_t __cdecl _wcstombs_s_l(size_t *_PtNumOfCharConverted,char *_Dst,size_t _DstSizeInBytes,const wchar_t *_Src,size_t _MaxCountInBytes,_locale_t _Locale);
+  __DEFINE_CPP_OVERLOAD_SECURE_FUNC_1_3(errno_t, _wcstombs_s_l, size_t*, _PtNumOfCharConverted, char, _Dst, const wchar_t*, _Src, size_t, _MaxCountInBytes, _locale_t, _Locale)
 
 #ifndef _POSIX_
   _CRTIMP errno_t __cdecl _ecvt_s(char *_DstBuf,size_t _Size,double _Val,int _NumOfDights,int *_PtDec,int *_PtSign);