diff --git a/include/unistd.h b/include/unistd.h
index 091ff16f4f92..a28be82f0168 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -494,6 +494,7 @@ struct crypt_data {
 int	 acct(const char *);
 int	 async_daemon(void);
 int	 check_utility_compat(const char *);
+ssize_t	 copy_file_range(int, off_t *, int, off_t *, size_t, unsigned int);
 const char *
 	 crypt_get_format(void);
 char	*crypt_r(const char *, const char *, struct crypt_data *);