diff --git a/src/end.c b/src/end.c
index 884ce05e8..a33e9ef07 100644
--- a/src/end.c
+++ b/src/end.c
@@ -39,7 +39,7 @@ static void NDECL(dump_plines);
 static void FDECL(dump_everything, (int, time_t));
 
 #if defined(__BEOS__) || defined(MICRO) || defined(OS2) || defined(WIN32)
-extern void FDECL(nethack_exit, (int));
+extern void FDECL(nethack_exit, (int)) NORETURN;
 #else
 #define nethack_exit exit
 #endif