diff --git a/lib/server.js b/lib/server.js
index 2f7c6ce..54ddbc9 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -769,7 +769,7 @@ WalletService.prototype._sampleFeeLevels = function(network, points, cb) {
       if (feePerKB < 0) {
         log.warn('Could not compute fee estimation (nbBlocks=' + p + ')');
       }
-      return next(null, [p, feePerKB * 1e8]);
+      return next(null, [p, Utils.strip(feePerKB * 1e8)]);
     });
   }, function(err, results) {
     if (err) return cb(err);