diff --git a/lib/classes/record/Interface.class.php b/lib/classes/record/Interface.class.php
index 80e1735260..f8e540be0b 100644
--- a/lib/classes/record/Interface.class.php
+++ b/lib/classes/record/Interface.class.php
@@ -100,7 +100,7 @@ interface record_Interface
 
     public function delete();
 
-    public function generate_subdefs(databox $databox, Logger $logger = null, Array $wanted_subdefs = null);
+    public function generate_subdefs(databox $databox, Logger $logger, Array $wanted_subdefs = null);
 
     public function log_view($log_id, $referrer, $gv_sit);
 
diff --git a/lib/classes/record/adapter.class.php b/lib/classes/record/adapter.class.php
index c483710472..a002e5df78 100644
--- a/lib/classes/record/adapter.class.php
+++ b/lib/classes/record/adapter.class.php
@@ -1655,7 +1655,7 @@ class record_adapter implements record_Interface, cache_cacheableInterface
      * @param  array           $wanted_subdefs An array of subdef names
      * @return \record_adapter
      */
-    public function generate_subdefs(databox $databox, Logger $logger = null, Array $wanted_subdefs = null)
+    public function generate_subdefs(databox $databox, Logger $logger, Array $wanted_subdefs = null)
     {
         $subdefs = $databox->get_subdef_structure()->getSubdefGroup($this->get_type());
 
diff --git a/tests/media/media_subdefTest.php b/tests/media/media_subdefTest.php
index b9a539d026..9f42952fea 100644
--- a/tests/media/media_subdefTest.php
+++ b/tests/media/media_subdefTest.php
@@ -29,8 +29,11 @@ class media_subdefTest extends \PhraseanetPHPUnitAbstract
 
         $file = new Alchemy\Phrasea\Border\File(\MediaVorus\MediaVorus::guess(new \SplFileInfo(__DIR__ . "/../testfiles/iphone_pic.jpg")), self::$collection);
 
+        $logger = new \Monolog\Logger('test');
+        $logger->pushHandler(new \Monolog\Handler\NullHandler());
+
         self::$recordonbleu = record_adapter::createFromFile($file);
-        self::$recordonbleu->generate_subdefs(self::$recordonbleu->get_databox());
+        self::$recordonbleu->generate_subdefs(self::$recordonbleu->get_databox(), $logger);
 
         foreach (self::$recordonbleu->get_subdefs() as $subdef) {