length.diff

diff --git a/index.js b/index.js
index 5bacf9d..fee9969 100644
--- a/index.js
+++ b/index.js
@@ -98,6 +98,7 @@ Store.prototype._write = function (offset, buf, cb) {
     var offsets = self._blocks(offset, offset + buf.length)
     var pending = 1
     var buffers = {}
+
     for (var i = 0; i < offsets.length; i++) (function (o,i) {
       if (o.end-o.start === self.size) return
       pending++
@@ -108,6 +109,7 @@ Store.prototype._write = function (offset, buf, cb) {
         if (--pending === 0) write(store, offsets, buffers)
       })
     })(offsets[i],i)
+
     if (--pending === 0) write(store, offsets, buffers)
   })
   function write (store, offsets, buffers) {
@@ -123,13 +125,19 @@ Store.prototype._write = function (offset, buf, cb) {
       store.put(block,self.name + DELIM + o.block)
       j += len
     }
+
+    backify(store.get(self.name + DELIM + "length"), function(err, ev) {
+      self.length = Math.max(self.length, ev.target.result|| 0)
       var length = Math.max(self.length || 0, offset + buf.length)
       store.put(length, self.name + DELIM + "length")
+
       store.transaction.addEventListener('complete', function () {
           self.length = length
           cb(null)
       })
+
       store.transaction.addEventListener('error', cb)
+    })
   }
 }