diff -r 989d9e117586 -r e7384fb35f7a DependencyInjection/Configuration.php
--- a/DependencyInjection/Configuration.php	Mon Dec 26 22:53:50 2011 +0100
+++ b/DependencyInjection/Configuration.php	Mon Jan 23 00:48:55 2012 +0100
@@ -38,7 +38,7 @@
                         ->performNoDeepMerging()
                         ->children()
                             ->scalarNode('type')->defaultValue('text')->end()
-                            ->scalarNode('length')
+                            ->scalarNode('length')->defaultValue(1024)
                                 ->beforeNormalization()
                                     ->ifString()
                                     ->then(function($v) { return intval($v); })