diff --git a/bind8/config-debian-linux-10.0-ALL b/bind8/config-debian-linux-10.0-ALL
index 1221bc0df..3a042bc0d 100644
--- a/bind8/config-debian-linux-10.0-ALL
+++ b/bind8/config-debian-linux-10.0-ALL
@@ -47,3 +47,4 @@ dnssec_info=1
 start_cmd=systemctl start bind9.service
 stop_cmd=systemctl stop bind9.service
 restart_cmd=systemctl reload bind9.service
+dnssec_period=21