diff -urNp a/agent/snmpd.c b/agent/snmpd.c
--- a/agent/snmpd.c	2018-10-04 10:34:10.939728847 +0200
+++ b/agent/snmpd.c	2018-10-04 10:34:43.910625603 +0200
@@ -325,6 +325,7 @@ usage(char *prog)
            "  -S d|i|0-7\t\tuse -Ls <facility> instead\n"
            "\n"
            );
+           exit(1);
 }
 
 static void