move_uploaded_file(...): failed to open stream: Permission denied in... Using Mac OS X Mountain Lion

move_uploaded_file(...): failed to open stream: Permission denied in...
Using Mac OS X Mountain Lion

So basically I have your classic 'move_uploaded_file' statement:
move_uploaded_file($_FILES['image']['tmp_name'], 'files/' .
$_FILES['image']['name']);
But I am getting this on my OS X Mountain Lion:
move_uploaded_file(...): failed to open stream: Permission denied in...
How can I change the permissions so I can move it?