diff --git a/htdocs/core/modules/modMargin.class.php b/htdocs/core/modules/modMargin.class.php
index b2bc41220c3..300911c7877 100644
--- a/htdocs/core/modules/modMargin.class.php
+++ b/htdocs/core/modules/modMargin.class.php
@@ -81,7 +81,7 @@ class modMargin extends DolibarrModules
 		// Example: $this->const=array(0=>array('MYMODULE_MYNEWCONST1','chaine','myvalue','This is a constant to add',1),
 		//                             1=>array('MYMODULE_MYNEWCONST2','chaine','myvalue','This is another constant to add',0, 'current', 1)
 		// );
-		$this->const = array(0=>array('MARGIN_TYPE','chaine','1','Rule for margin calculation by default',0,'current',0));			// List of particular constants to add when module is enabled
+		$this->const = array(0=>array('MARGIN_TYPE','chaine','costprice','Rule for margin calculation by default',0,'current',0));			// List of particular constants to add when module is enabled
 
 		// New pages on tabs
 		$this->tabs = array(