diff --git a/dns.parser.js b/dns.parser.js
index d65eee7..858451a 100644
--- a/dns.parser.js
+++ b/dns.parser.js
@@ -7,7 +7,6 @@ var classes = exports.DNS_CLASSES || require('./dns.classes.js').DNS_CLASSES;
 var types = exports.DNS_TYPES || require('./dns.types.js').DNS_TYPES;
 
 // Order http://www.zytrax.com/books/dns/ch15/
-var packet = {};
 pdns.unpackHeader = function (i) {
   // i is one element from a Uint16Array (as a 16-bit unsigned integer)
 
@@ -32,7 +31,7 @@ pdns.unpackHeader = function (i) {
 
 pdns._unpackLabels = exports.DNS_UNPACK_LABELS || require('./dns.unpack-labels.js').DNS_UNPACK_LABELS;
 
-pdns.unpackOpt = function (ab, rec) {
+pdns.unpackOpt = function (ab, packet, rec) {
   var dv;
 
   // https://tools.ietf.org/html/rfc6891#section-6
@@ -94,6 +93,7 @@ pdns.unpack = function (ab) {
   // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView
   var dv = new DataView(ab);
   var id = dv.getUint16(0, false);
+  var packet = {};
   packet.header = pdns.unpackHeader(dv.getUint16(2, false));
   packet.qdcount = dv.getUint16(4, false);  // query count
   packet.ancount = dv.getUint16(6, false);  // answer count
@@ -238,7 +238,7 @@ pdns.unpack = function (ab) {
     total += rec.byteLength;
     if (0x29 === rec.type) {
       // OPT 41 (0x29)
-      pdns.unpackOpt(ab, rec);
+      pdns.unpackOpt(ab, packet, rec);
       continue;
     }
     packet.additional.push(rec);