diff --git a/lib/core.js b/lib/core.js
index b04010fd8..84632d99f 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -44,11 +44,11 @@ var Archiver = function(format, options) {
 
   Transform.call(this, options);
 
-  this._entries = [];
   this._format = false;
   this._module = false;
   this._pending = 0;
   this._pointer = 0;
+  this._totalBytes = 0
 
   this._queue = async.queue(this._onQueueTask.bind(this), 1);
   this._queue.drain = this._onQueueDrain.bind(this);
@@ -190,7 +190,11 @@ Archiver.prototype._moduleAppend = function(source, data, callback) {
      * @type {EntryData}
      */
     this.emit('entry', data);
-    this._entries.push(data);
+
+    var size = data.stats ? data.stats.size : data.size || 0
+
+    this._totalBytes += size
+    this.emit('progress', {total: this._totalBytes, size: size})
 
     setImmediate(callback);
   }.bind(this));
diff --git a/test/archiver.js b/test/archiver.js
index 4f6a989c2..1e20c664c 100644
--- a/test/archiver.js
+++ b/test/archiver.js
@@ -66,6 +66,11 @@ describe('archiver', function() {
 
         archive.pipe(testStream);
 
+        archive.on('progress', function(progress) {
+          assert.property(progress, 'total')
+          assert.property(progress, 'size')
+        })
+
         archive
           .append(testBuffer, { name: 'buffer.txt', date: testDate })
           .append(fs.createReadStream('test/fixtures/test.txt'), { name: 'stream.txt', date: testDate })