diff --git a/lib/docker.js b/lib/docker.js
index 656bf2c..e0ad2fe 100644
--- a/lib/docker.js
+++ b/lib/docker.js
@@ -475,7 +475,10 @@ Docker.prototype.pull = function(repoTag, opts, callback, auth) {
   args.opts.fromImage = imageSrc.repository;
   args.opts.tag = imageSrc.tag;
 
-  var argsf = [auth, args.opts, args.callback];
+  var argsf = [args.opts, args.callback];
+  if(auth) {
+    argsf = [auth, args.opts, args.callback];
+  }
   return this.createImage.apply(this, argsf);
 };
 
diff --git a/package.json b/package.json
index bf0d2fa..9f19636 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "dockerode",
   "description": "Docker Remote API module.",
-  "version": "2.2.6",
+  "version": "2.2.7",
   "author": "Pedro Dias <petermdias@gmail.com>",
   "maintainers": [
     "apocas <petermdias@gmail.com>"