diff --git a/lib/miner/minerblock.js b/lib/miner/minerblock.js
index c469b0db..d77c3350 100644
--- a/lib/miner/minerblock.js
+++ b/lib/miner/minerblock.js
@@ -314,13 +314,13 @@ MinerBlock.prototype.findNonce = function findNonce() {
 MinerBlock.prototype.findNonceAsync = co(function* findNonceAsync() {
   var block = this.block;
   var target = this.target;
-  var data = block.abbr();
   var interval = MinerBlock.INTERVAL;
   var min = 0;
   var max = interval;
-  var nonce;
+  var data, nonce;
 
   while (max <= 0xffffffff) {
+    data = block.abbr();
     nonce = yield workers.pool.mine(data, target, min, max);
 
     if (this.destroyed)