Stop using TRUE and FALSE for exit status.
diff --git a/usleep.c b/usleep.c
index 69790ef..86dc050 100644
--- a/usleep.c
+++ b/usleep.c
@@ -32,5 +32,5 @@
 	}
 
 	usleep(atoi(*(++argv)));	/* return void */
-	return(TRUE);
+	return EXIT_SUCCESS;
 }