diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index b06197bb..8cde1c1f 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -827,10 +827,10 @@ ChainDB.prototype.del = function del(height) {
   // If we deleted several blocks at the end, go back
   // to the last non-null block and truncate the file
   // beyond that point.
-  if (height * BLOCK_SIZE + BLOCK_SIZE === this.size()) {
+  if ((height + 1) * BLOCK_SIZE === this.size()) {
     while (this.isNull(height))
       height--;
-    fs.ftruncateSync(this.fd, height * BLOCK_SIZE + BLOCK_SIZE);
+    fs.ftruncateSync(this.fd, (height + 1) * BLOCK_SIZE);
   }
 
   return true;
@@ -845,8 +845,8 @@ ChainDB.prototype.isNull = function isNull(height) {
 
 ChainDB.prototype._read = function _read(size, offset) {
   var data = this.getBuffer(size);
-  var bytes = 0;
   var index = 0;
+  var bytes;
 
   if (offset < 0 || offset == null)
     return;
@@ -866,15 +866,12 @@ ChainDB.prototype._read = function _read(size, offset) {
 
 ChainDB.prototype._write = function _write(data, offset, callback) {
   var self = this;
-  var size, bytes, index;
+  var size = data.length;
+  var index = 0;
 
   if (offset < 0 || offset == null)
     return false;
 
-  size = data.length;
-  bytes = 0;
-  index = 0;
-
   (function callee() {
     fs.write(self.fd, data, index, size, offset, function(err, bytes) {
       if (err)
@@ -893,15 +890,13 @@ ChainDB.prototype._write = function _write(data, offset, callback) {
 };
 
 ChainDB.prototype._writeSync = function _writeSync(data, offset) {
-  var size, bytes, index;
+  var size = data.length;
+  var index = 0;
+  var bytes;
 
   if (offset < 0 || offset == null)
     return false;
 
-  size = data.length;
-  bytes = 0;
-  index = 0;
-
   while (bytes = fs.writeSync(this.fd, data, index, size, offset)) {
     index += bytes;
     size -= bytes;