diff --git a/lib/size-chunker.js b/lib/size-chunker.js
index 401957b..33d7b0f 100644
--- a/lib/size-chunker.js
+++ b/lib/size-chunker.js
@@ -66,15 +66,17 @@
       this._bytesPassed += buf.length;
    };
 
-   SizeChunker.prototype._startIfNeededAndPushData = function(buf) {
+   SizeChunker.prototype._startIfNeededAndPushData = function(buf, done) {
 
       if (this._lastEmittedChunk != this._currentChunk) {
          this._startChunk(function() {
             this._lastEmittedChunk = this._currentChunk;
             this._pushData(buf);
+            done();
          }.bind(this))
       } else {
          this._pushData(buf);
+         done();
       }
 
    };
@@ -89,19 +91,22 @@
 
          if (this._bytesPassed + chunk.length < this._chunkSize) {
 
-            this._startIfNeededAndPushData(chunk);
-            done();
+            this._startIfNeededAndPushData(chunk, done);
          } else {
 
             remainder = bytesLeave - chunk.length;
 
             if (remainder === 0) {
-               this._startIfNeededAndPushData(chunk);
-               this._finishChunk(done);
+               this._finishChunk(function() {
+                  this._startIfNeededAndPushData(chunk, done);
+               }.bind(this));
             } else {
-               this._startIfNeededAndPushData(chunk.slice(0, bytesLeave));
-               chunk = chunk.slice(bytesLeave);
-               this._finishChunk(_do_transform);
+               this._finishChunk(function() {
+                  this._startIfNeededAndPushData(chunk.slice(0, bytesLeave), function() {
+                     chunk = chunk.slice(bytesLeave);
+                     _do_transform();
+                  });
+               }.bind(this));
             }
          }