diff --git a/rootfs/app/entrypoint.sh b/rootfs/app/entrypoint.sh
index 98d7377..535d75e 100755
--- a/rootfs/app/entrypoint.sh
+++ b/rootfs/app/entrypoint.sh
@@ -32,9 +32,9 @@ EOF
 fi
 
 # set port
-cat >> /etc/unbound/unbound.conf.d/port.conf << EOF
+cat > /etc/unbound/unbound.conf.d/port.conf << EOF
 server:
-    interface: 0.0.0.0:${PORT}
+    port: ${PORT}
 EOF
 
 if [ "${DNSPROXY}" = true ] ; then
diff --git a/rootfs/etc/unbound/unbound.conf b/rootfs/etc/unbound/unbound.conf
index b255c21..76bc348 100644
--- a/rootfs/etc/unbound/unbound.conf
+++ b/rootfs/etc/unbound/unbound.conf
@@ -1,6 +1,5 @@
 server:
     interface: 0.0.0.0
-    port: 53
     do-ip4: yes
     do-ip6: no
     do-udp: yes
diff --git a/rootfs/etc/unbound/unbound.conf.d/port.conf b/rootfs/etc/unbound/unbound.conf.d/port.conf
new file mode 100644
index 0000000..264bc5e
--- /dev/null
+++ b/rootfs/etc/unbound/unbound.conf.d/port.conf
@@ -0,0 +1,2 @@
+server:
+    port:  1053