1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/check_ping.c b/plugins/check_ping.c
index 7ff7f28..74aa3b7 100644
--- a/plugins/check_ping.c
+++ b/plugins/check_ping.c
@@ -187,7 +187,7 @@ process_arguments (int argc, char **argv)
 
                 switch (c) {
                 case '?':       /* usage */
-                        usage2 ("Unknown argument", optarg);
+                        usage3 ("Unknown argument", optopt);
                 case 'h':       /* help */
                         print_help ();
                         exit (STATE_OK);