diff --git a/include/locale.h b/include/locale.h
index 9587815767ab..86eda17d34d7 100644
--- a/include/locale.h
+++ b/include/locale.h
@@ -75,9 +75,6 @@ struct lconv {
 __BEGIN_DECLS
 struct lconv	*localeconv __P((void));
 char		*setlocale __P((int, const char *));
-#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
-int		collate_range_cmp __P((int, int));
-#endif /* neither ANSI nor POSIX */
 __END_DECLS
 
 #endif /* _LOCALE_H_ */