--- a/mingw-w64-headers/crt/stdlib.h
+++ b/mingw-w64-headers/crt/stdlib.h
@@ -387,6 +387,9 @@
 #define _CRT_TERMINATE_DEFINED
   void __cdecl __MINGW_NOTHROW exit(int _Code) __MINGW_ATTRIB_NORETURN;
   void __cdecl __MINGW_NOTHROW _exit(int _Code) __MINGW_ATTRIB_NORETURN;
+#ifdef _UCRT
+  void __cdecl __MINGW_NOTHROW quick_exit(int _Code) __MINGW_ATTRIB_NORETURN;
+#endif

 #if !defined __NO_ISOCEXT /* extern stub in static libmingwex.a */
   /* C99 function name */
@@ -420,6 +423,9 @@
 #endif

   int __cdecl atexit(void (__cdecl *)(void));
+#ifdef _UCRT
+  int __cdecl at_quick_exit(void (__cdecl *)(void));
+#endif
 #ifndef _CRT_ATOF_DEFINED
 #define _CRT_ATOF_DEFINED
   double __cdecl atof(const char *_String);