diff --git a/htdocs/projet/admin/project.php b/htdocs/projet/admin/project.php
index 0252ab58f36..67317583273 100644
--- a/htdocs/projet/admin/project.php
+++ b/htdocs/projet/admin/project.php
@@ -1,11 +1,11 @@
 <?php
 /* Copyright (C) 2010-2014	Regis Houssin		<regis.houssin@capnetworks.com>
  * Copyright (C) 2011-2016	Laurent Destailleur	<eldy@users.sourceforge.net>
- * Copyright (C) 2011-2012	Juanjo Menent		<jmenent@2byte.es>
+ * Copyright (C) 2011-2015	Juanjo Menent		<jmenent@2byte.es>
  * Copyright (C) 2011-2015	Philippe Grand		<philippe.grand@atoo-net.com>
  * Copyright (C) 2013		Florian Henry		<florian.henry@open-concept.pro>
- * Copyright (C) 2015		Juanjo Menent		<jmenent@2byte.es>
  * Copyright (C) 2015       Marcos García       <marcosgdf@gmail.com>
+ * Copyright (C) 2018		Ferran Marcet		<fmarcet@2byte.es>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -59,7 +59,7 @@ if ($action == 'setmainoptions')
 	else dolibarr_del_const($db, "PROJECT_USE_OPPORTUNITIES", $conf->entity);
 
 	// Warning, the constant saved and used in code is PROJECT_HIDE_TASKS
-	if (GETPOST('PROJECT_USE_TASKS')) dolibarr_del_const($db, "PROJECT_USE_TASKS", $conf->entity);
+	if (GETPOST('PROJECT_USE_TASKS')) dolibarr_del_const($db, "PROJECT_HIDE_TASKS", $conf->entity);
 	else dolibarr_set_const($db, "PROJECT_HIDE_TASKS",1,'chaine',0,'',$conf->entity);
 }