diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index 518eaf14d..f6677e43e 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -406,7 +406,7 @@ class Config
 		'log_filename_builder_impl' => array(
 			'type' => 'string',
 			'description' => 'Name of the iLogFileNameBuilder to use',
-			'default' => 'timezone',
+			'default' => 'MonthlyRotatingLogFileNameBuilder',
 			'value' => '',
 			'source_of_value' => '',
 			'show_in_conf_sample' => false,