diff --git a/lib/jobManager.js b/lib/jobManager.js
index 04d8932..9b8e7b8 100644
--- a/lib/jobManager.js
+++ b/lib/jobManager.js
@@ -14,10 +14,9 @@ var blockTemplate = require('./blockTemplate.js');
 
 //Unique extranonce per subscriber
 var ExtraNonceCounter = function(){
-    //var instanceId = 31;
-    //var counter = instanceId << 27;
-    var counter = 1;
-    var size = util.packUInt32BE(counter).length; //binpack.packUInt32(counter, 'big').length;
+    var instanceId = 31;
+    var counter = instanceId << 27;
+    var size = util.packUInt32BE(Math.abs(counter)).length; //binpack.packUInt32(counter, 'big').length;
 
     this.next = function(){
         var extraNonce = util.packUInt32BE(counter++);//binpack.packUInt32(counter++, 'big');