diff --git a/rootfs/tmp/etc/bind/named.conf b/rootfs/tmp/etc/bind/named.conf
index 228da60..65a1c94 100644
--- a/rootfs/tmp/etc/bind/named.conf
+++ b/rootfs/tmp/etc/bind/named.conf
@@ -8,7 +8,7 @@ key "backup-key" { algorithm hmac-sha512; secret "REPLACE_KEY_BACKUP"; };
 #####################################################################
 # access settings
 acl "all" { 0.0.0.0/0; ::/0; };
-acl "secondary" { REPLACE_DNS_SERVER_SECONDARY; };
+acl "secondary" { REPLACE_DNS_SERVER_SECONDARY };
 acl "trusted" { 10.0.0.0/8; 127.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16; };
 acl "updates" { key "dhcp-key"; key "certbot."; };
 acl "transfers" {key "dhcp-key"; key "certbot."; key "backup-key"; secondary; };
@@ -27,9 +27,9 @@ options {
   max-ncache-ttl 10800;
   max-udp-size 4096;
   notify yes;
-  also-notify { REPLACE_DNS_SERVER_SECONDARY; };
+  also-notify { REPLACE_DNS_SERVER_SECONDARY };
   allow-update { updates; };
-  allow-update-forwarding { REPLACE_DNS_SERVER_SECONDARY; };
+  allow-update-forwarding { REPLACE_DNS_SERVER_SECONDARY };
   allow-transfer { trusted; };
   transfer-format many-answers;
   allow-query { any; };
diff --git a/rootfs/usr/local/etc/docker/init.d/02-named.sh b/rootfs/usr/local/etc/docker/init.d/02-named.sh
index 92fa18d..72200f4 100755
--- a/rootfs/usr/local/etc/docker/init.d/02-named.sh
+++ b/rootfs/usr/local/etc/docker/init.d/02-named.sh
@@ -250,6 +250,7 @@ __run_pre_execute_checks() {
 __update_conf_files() {
   local exitCode=0                                               # default exit code
   local sysname="${SERVER_NAME:-${FULL_DOMAIN_NAME:-$HOSTNAME}}" # set hostname
+  local secondary_ip=""
   # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   # delete files
   #__rm ""
@@ -262,6 +263,12 @@ __update_conf_files() {
     touch "$LOG_DIR/$logfile"
     chmod -Rf 777 "$logfile"
   done
+  if [ -n "$DNS_SERVER_SECONDARY" ]; then
+    for ip in ${DNS_SERVER_SECONDARY//;/ }; do
+      secondary_ip+="$ip; "
+    done
+  fi
+  DNS_SERVER_SECONDARY="$secondary_ip"
   # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   # replace variables
   __replace "REPLACE_KEY_RNDC" "$KEY_RNDC" "$ETC_DIR/rndc.key"
@@ -269,9 +276,13 @@ __update_conf_files() {
   __replace "REPLACE_KEY_DHCP" "$KEY_DHCP" "$NAMED_CONFIG_FILE"
   __replace "REPLACE_KEY_BACKUP" "$KEY_BACKUP" "$NAMED_CONFIG_FILE"
   __replace "REPLACE_KEY_CERTBOT" "$KEY_CERTBOT" "$NAMED_CONFIG_FILE"
-  __replace "REPLACE_DNS_SERVER_SECONDARY" "$DNS_SERVER_SECONDARY" "$NAMED_CONFIG_FILE"
   __find_replace "REPLACE_DNS_SERIAL" "$DNS_SERIAL" "$DATA_DIR/primary"
   __find_replace "REPLACE_DNS_SERIAL" "$DNS_SERIAL" "$DATA_DIR/secondary"
+  if [ -n "$DNS_SERVER_SECONDARY" ]; then
+    __replace "REPLACE_DNS_SERVER_SECONDARY" "$DNS_SERVER_SECONDARY" "$NAMED_CONFIG_FILE"
+  else
+    sed -i '/REPLACE_DNS_SERVER_SECONDARY/d' "$NAMED_CONFIG_FILE"
+  fi
   # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
   # define actions
   if [ -f "$CONF_DIR/custom.conf" ]; then