diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 716c5eb8..f39bb093 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -130,7 +130,7 @@ utils.toBase58 = function toBase58(buf) {
   var zeroes = 0;
   var length = 0;
   var str = '';
-  var i, size, b58, carry, j, k;
+  var i, b58, carry, j, k;
 
   for (i = 0; i < buf.length; i++) {
     if (buf[i] !== 0)
@@ -138,8 +138,7 @@ utils.toBase58 = function toBase58(buf) {
     zeroes++;
   }
 
-  size = ((buf.length * 138 / 100) | 0) + 1;
-  b58 = new Buffer(size);
+  b58 = new Buffer(((buf.length * 138 / 100) | 0) + 1);
   b58.fill(0);
 
   for (; i < buf.length; i++) {
@@ -156,7 +155,7 @@ utils.toBase58 = function toBase58(buf) {
     length = j;
   }
 
-  i = size - length;
+  i = b58.length - length;
   while (i < b58.length && b58[i] === 0)
     i++;