diff --git a/install-dev/upgrade/sql/1.5.5.0.sql b/install-dev/upgrade/sql/1.5.5.0.sql
index 152e75ea9..7a3a1a17b 100644
--- a/install-dev/upgrade/sql/1.5.5.0.sql
+++ b/install-dev/upgrade/sql/1.5.5.0.sql
@@ -20,9 +20,9 @@ CHANGE `module_name` `module_name` VARCHAR(64) NULL DEFAULT NULL;
 /* PHP:add_module_to_hook(blockmyaccount, actionModuleUnRegisterHookAfter); */;
 /* PHP:add_module_to_hook(blockmyaccountfooter, actionModuleUnRegisterHookAfter); */;
 
-ALTER TABLE `PREFIX_log` ADD `id_employee` INT(10) UNSIGNED NULL AFTER `object_id`;
+ALTER TABLE `PREFIX_log` ADD `id_employee` INT(10) UNSIGNED NULL DEFAULT NULL AFTER `object_id`;
 
 SET @id_parent = (SELECT IFNULL(id_tab, 1) FROM `PREFIX_tab` WHERE `class_name` = 'AdminPriceRule' LIMIT 1);
 UPDATE `PREFIX_tab` SET id_parent = @id_parent WHERE `id_parent` = 1 AND `class_name` = 'AdminMarketing' LIMIT 1;
 
-UPDATE `PREFIX_hook` SET `description` = 'This hook is called when a new credit slip is added regarding client order' WHERE `name` = 'actionOrderSlipAdd';
\ No newline at end of file
+UPDATE `PREFIX_hook` SET `description` = 'This hook is called when a new credit slip is added regarding client order' WHERE `name` = 'actionOrderSlipAdd';