diff --git a/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_device_tbl.c b/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_device_tbl.c
index f2586823a208..7e8143649167 100644
--- a/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_device_tbl.c
+++ b/usr.sbin/bsnmpd/modules/snmp_hostres/hostres_device_tbl.c
@@ -480,6 +480,7 @@ devd_socket_callback(int fd, void *arg __unused)
 		case '+':
 		case '-':
 		case '?':
+		case '!':
 			refresh_device_tbl(1);
 			return;
 		default: