diff --git a/dns.parser.js b/dns.parser.js
index 92d7b31..1d4a8a6 100644
--- a/dns.parser.js
+++ b/dns.parser.js
@@ -198,6 +198,7 @@ pdns.unpack = function (ab) {
     q.rdlength = dv.getUint16(total, false);
     total += 2;
 
+    q.class &= 0x7fff;
     q.className = classes[q.class];
     q.typeName = types[q.type];