diff --git a/v4/dhcpd.conf b/v4/dhcpd.conf
index 3fbfefd..ebeca0d 100644
--- a/v4/dhcpd.conf
+++ b/v4/dhcpd.conf
@@ -1,6 +1,8 @@
 #-------------------------------
 # Global options
 #-------------------------------
+authoritative;
+
 option domain-name "hogeserver.hogeddns.jp";
 option domain-name-servers 192.168.110.10;
 option routers 192.168.110.10;
diff --git a/v6/dhcpd.conf b/v6/dhcpd.conf
index 9ea19b9..f32e6bf 100644
--- a/v6/dhcpd.conf
+++ b/v6/dhcpd.conf
@@ -1,6 +1,8 @@
 #-------------------------------
 # Global options
 #-------------------------------
+authoritative;
+
 option dhcp6.domain-search "hogeserver.hogeddns.jp";
 option dhcp6.name-servers fdaa:aaaa:aaaa:aaaa::10;