diff --git a/include/windconf.h b/include/windconf.h
index 829b761be..78c4a431e 100644
--- a/include/windconf.h
+++ b/include/windconf.h
@@ -99,12 +99,7 @@ extern char *windows_exepath(void);
  */
 
 #ifdef __MINGW32__
-#if 0
 #define MD_USE_TMPFILE_S
-#if !defined(__cplusplus)
-extern errno_t tmpfile_s(FILE * restrict * restrict streamptr);
-#endif
-#endif
 #
 #ifdef strncasecmp
 #undef strncasecmp