#if USE_WIDEC_SUPPORT
-#if defined(_WIN32) && !defined(_MSC_VER)
+#if defined(_NC_WINDOWS) && !defined(_MSC_VER) && !defined(EXP_WIN32_DRIVER)
/*
* MinGW has wide-character functions, but they do not work correctly.
*/
extern int __MINGW_NOTHROW _nc_mblen(const char *, size_t);
#define mblen(s,n) _nc_mblen(s, n)
-#endif /* _WIN32 */
+#endif /* _WIN32||_WIN64 */
#if HAVE_MBTOWC && HAVE_MBLEN
#define reset_mbytes(state) IGNORE_RC(mblen(NULL, 0)), IGNORE_RC(mbtowc(NULL, NULL, 0))