diff --git a/lib/server.js b/lib/server.js
index 82170da..07f257b 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -770,8 +770,8 @@ WalletService.prototype._sampleFeeLevels = function(network, points, cb) {
   var self = this;
 
   // TODO: cache blockexplorer data
+  var bc = self._getBlockchainExplorer(network);
   async.map(points, function(p, next) {
-    var bc = self._getBlockchainExplorer(network);
     bc.estimateFee(p, function(err, result) {
       if (err) {
         log.error('Error estimating fee', err);