diff --git a/lib/logmsg/logmsg.c b/lib/logmsg/logmsg.c
index 67fce48f2..805a30a9e 100644
--- a/lib/logmsg/logmsg.c
+++ b/lib/logmsg/logmsg.c
@@ -2030,6 +2030,7 @@ log_msg_tags_init(void)
   log_tags_register_predefined_tag("syslog.invalid_hostname", LM_T_SYSLOG_INVALID_HOSTNAME);
   log_tags_register_predefined_tag("syslog.unexpected_framing", LM_T_SYSLOG_UNEXPECTED_FRAMING);
   log_tags_register_predefined_tag("syslog.rfc3164_missing_header", LM_T_SYSLOG_RFC3164_MISSING_HEADER);
+  log_tags_register_predefined_tag("syslog.rfc3164_invalid_program", LM_T_SYSLOG_RFC_3164_INVALID_PROGRAM);
 
   log_tags_register_predefined_tag("syslog.rfc5424_missing_hostname", LM_T_SYSLOG_RFC5424_MISSING_HOSTNAME);
   log_tags_register_predefined_tag("syslog.rfc5424_missing_app_name", LM_T_SYSLOG_RFC5424_MISSING_APP_NAME);
diff --git a/lib/logmsg/logmsg.h b/lib/logmsg/logmsg.h
index c513eb43f..849eb80a6 100644
--- a/lib/logmsg/logmsg.h
+++ b/lib/logmsg/logmsg.h
@@ -134,6 +134,9 @@ enum
   LM_T_SYSLOG_RFC5424_MISSING_MESSAGE,
   /* message field missing */
   LM_T_SYSLOG_MISSING_MESSAGE,
+  /* invalid program name */
+  LM_T_SYSLOG_RFC_3164_INVALID_PROGRAM,
+
   LM_T_PREDEFINED_MAX,
 };