diff --git a/htdocs/adherents/cotisation.class.php b/htdocs/adherents/cotisation.class.php
index 3cf7ec3a0c3..33d8dbef255 100644
--- a/htdocs/adherents/cotisation.class.php
+++ b/htdocs/adherents/cotisation.class.php
@@ -24,6 +24,8 @@
  *		\version    $Id$
  */
 
+require_once(DOL_DOCUMENT_ROOT."/core/commonobject.class.php");
+
 
 /**
  *	\class 		Cotisation
diff --git a/htdocs/projet/tasks/task.class.php b/htdocs/projet/tasks/task.class.php
index 9bf1e6d2707..c184c1a21b6 100644
--- a/htdocs/projet/tasks/task.class.php
+++ b/htdocs/projet/tasks/task.class.php
@@ -25,6 +25,8 @@
  *		\remarks	Initialy built by build_class_from_table on 2008-09-10 12:41
  */
 
+require_once(DOL_DOCUMENT_ROOT."/core/commonobject.class.php");
+
 
 /**
  *      \class      Task
diff --git a/htdocs/user/group/usergroup.class.php b/htdocs/user/group/usergroup.class.php
index 4d4f9b5427b..37118d7adda 100644
--- a/htdocs/user/group/usergroup.class.php
+++ b/htdocs/user/group/usergroup.class.php
@@ -24,6 +24,7 @@
  *	 \version    $Id$
  */
 
+require_once(DOL_DOCUMENT_ROOT."/core/commonobject.class.php");
 if ($conf->ldap->enabled) require_once (DOL_DOCUMENT_ROOT."/lib/ldap.class.php");