Stop using TRUE and FALSE for exit status.
diff --git a/length.c b/length.c
index 14d15c8..1ab4e3a 100644
--- a/length.c
+++ b/length.c
@@ -9,5 +9,5 @@
 	if (argc != 2 || **(argv + 1) == '-')
 		usage(length_usage);
 	printf("%lu\n", (long)strlen(argv[1]));
-	return (TRUE);
+	return EXIT_SUCCESS;
 }