diff -urNp a/snmplib/snmp_logging.c b/snmplib/snmp_logging.c
--- a/snmplib/snmp_logging.c	2023-02-15 10:19:15.691827254 +0100
+++ b/snmplib/snmp_logging.c	2023-02-15 10:24:41.006642974 +0100
@@ -490,7 +490,7 @@ snmp_log_options(char *optarg, int argc,
 char *
 snmp_log_syslogname(const char *pstr)
 {
-  if (pstr)
+  if (pstr && (pstr != syslogname))
     strlcpy (syslogname, pstr, sizeof(syslogname));
 
   return syslogname;