1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index 94214ee0..94b97c4f 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -664,7 +664,7 @@ process_arguments (int argc, char **argv)
                         print_help ();
                         exit (STATE_OK);
                 case '?':                                                                       /* help */
-                        usage2 (_("Unknown argument"), optarg);
+                        usage5 ();
                 }
         }