diff --git a/lib/buffer.js b/lib/buffer.js
new file mode 100644
index 0000000..6b5fb20
--- /dev/null
+++ b/lib/buffer.js
@@ -0,0 +1,22 @@
+
+/*!
+ * Canvas - Buffer
+ * Copyright (c) 2010 LearnBoost <tj@learnboost.com>
+ * MIT Licensed
+ */
+
+/**
+ * Concatenate `this` Buffer with `other`.
+ *
+ * @param {Buffer} other
+ * @return {Buffer}
+ * @api public
+ */
+
+Buffer.prototype.concat = function(other) {
+  var len = this.length
+    , buf = new Buffer(len + other.length);
+  this.copy(buf, 0, 0);
+  other.copy(buf, len, 0);
+  return buf;
+};
\ No newline at end of file
diff --git a/lib/canvas.js b/lib/canvas.js
index c4884f4..dc5a656 100644
--- a/lib/canvas.js
+++ b/lib/canvas.js
@@ -15,8 +15,7 @@ var canvas = require('../build/default/canvas')
   , Context2d = canvas.CanvasRenderingContext2d
   , CanvasGradient = canvas.CanvasGradient
   , cairoVersion = canvas.cairoVersion
-  , PNGStream = require('./pngstream')
-  , utils = require('./utils');
+  , PNGStream = require('./pngstream');
 
 /**
  * Export `Canvas` as the module.
@@ -42,6 +41,12 @@ exports.cairoVersion = cairoVersion;
 
 var cache = {};
 
+/**
+ * Buffer extensions.
+ */
+
+require('./buffer');
+
 /**
  * Return a function used to normalize an RGBA color `prop`.
  *
@@ -188,16 +193,16 @@ Canvas.prototype.createSyncPNGStream = function(){
  */
 
 Canvas.prototype.toBuffer = function(){
-  var bufs = []
-    , lens = [];
+  var buf;
   this.streamPNGSync(function(err, chunk, len){
     if (err) throw err;
     if (len) {
-      bufs.push(chunk);
-      lens.push(len);
-    };
+      buf = buf
+        ? buf.concat(chunk)
+        : chunk;
+    }
   });
-  return utils.concatBuffers(bufs, lens);
+  return buf;
 };
 
 /**
diff --git a/lib/utils.js b/lib/utils.js
deleted file mode 100644
index bed53ff..0000000
--- a/lib/utils.js
+++ /dev/null
@@ -1,36 +0,0 @@
-
-/*!
- * Canvas - utils
- * Copyright (c) 2010 LearnBoost <tj@learnboost.com>
- * MIT Licensed
- */
-
-/**
- * Concatenate `bufs` / `lens`.
- *
- * @param {Array} bufs
- * @param {Array} lens
- * @return {Buffer}
- * @api private
- */
-
-exports.concatBuffers = function(bufs, lens) {
-  var buf
-    , length = 0
-    , offset = 0;
-
-  // Determine length
-  for (var i = 0, len = lens.length; i < len; ++i) {
-    length += lens[i];
-  }
-
-  // Allocate buffer
-  buf = new Buffer(length);
-
-  // Copy
-  for (var i = 0, len = bufs.length; i < len; ++i) {
-    bufs[i].copy(buf, offset);
-    offset += lens[i];
-  }
-  return buf;
-};
\ No newline at end of file