diff --git a/lib/client.js b/lib/client.js
index 23d5576..bb9b501 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -30,6 +30,7 @@ function Client(isServer) {
   this.encryptionEnabled = false;
   this.cipher = null;
   this.decipher = null;
+  this.compressionThreshold = -1;
   this.packetsToParse = {};
   this.on('newListener', function(event, listener) {
     var direction = this.isServer ? 'toServer' : 'toClient';
diff --git a/lib/protocol.js b/lib/protocol.js
index 0d0cece..87cb3d3 100644
--- a/lib/protocol.js
+++ b/lib/protocol.js
@@ -58,6 +58,9 @@ var packets = {
       success:      {id: 0x02, fields: [
         { name: "uuid", type: "string" },
         { name: "username", type: "string" }
+      ]},
+      compress: { id: 0x03, fields: [
+        { name: "threshold", type: "varint"}
       ]}
     },
     toServer: {
@@ -534,6 +537,9 @@ var packets = {
       ]},
       kick_disconnect:         {id: 0x40, fields: [
         { name: "reason", type: "string" }
+      ]},
+      compress: { id: 0x46, fields: [
+        { name: "threshold", type: "varint"}
       ]}
     },
     toServer: {