diff --git a/lib/jobManager.js b/lib/jobManager.js
index 9b8e7b8..c10d020 100644
--- a/lib/jobManager.js
+++ b/lib/jobManager.js
@@ -19,7 +19,7 @@ var ExtraNonceCounter = function(){
     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');
+        var extraNonce = util.packUInt32BE(Math.abs(counter++));//binpack.packUInt32(counter++, 'big');
         return extraNonce.toString('hex');
     };
     this.size = function(){