diff --git a/bundle/DependencyInjection/Configuration.php b/bundle/DependencyInjection/Configuration.php
index b7c62e0..00bfa81 100644
--- a/bundle/DependencyInjection/Configuration.php
+++ b/bundle/DependencyInjection/Configuration.php
@@ -133,7 +133,6 @@ public function getConfigTreeBuilder()
                 ->end()
                 ->integerNode('max_file_size')
                     ->defaultValue(64000000) // 64MB
-                    ->cannotBeEmpty()
                 ->end()
             ->end()
         ;