diff -u -p a/mboxfs/mboxfs.c b/mboxfs/mboxfs.c
--- a/mboxfs/mboxfs.c
+++ b/mboxfs/mboxfs.c
@@ -98,7 +98,7 @@ mboxfs_parse_opts (int key, char *arg, s
     case ARGP_KEY_ARG:
       mboxfs_options.file_name = strdup (arg);
       if (!mboxfs_options.file_name || !strlen (mboxfs_options.file_name))
-	error (1, 1, "No mailbox specified.");
+	argp_error(sate, "No mailbox specified.");
   }
 
   return 0;