diff --git a/htdocs/societe/class/api_contacts.class.php b/htdocs/societe/class/api_contacts.class.php
index fcfdf4ad084..5f52c2b775c 100644
--- a/htdocs/societe/class/api_contacts.class.php
+++ b/htdocs/societe/class/api_contacts.class.php
@@ -19,6 +19,7 @@ use Luracast\Restler\RestException;
 
 //require_once DOL_DOCUMENT_ROOT . '/contact/class/contact.class.php';
 
+
 /**
  * API class for contacts
  *
@@ -48,7 +49,8 @@ class Contacts extends DolibarrApi
 		global $db, $conf;
 		$this->db = $db;
 
-		include_once DOL_DOCUMENT_ROOT.'/contact/class/contact.class.php';
+		require_once DOL_DOCUMENT_ROOT.'/contact/class/contact.class.php';
+		require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
 
 		$this->contact = new Contact($this->db);
 	}
diff --git a/htdocs/societe/class/api_thirdparties.class.php b/htdocs/societe/class/api_thirdparties.class.php
index 292288d9015..2b71e59badf 100644
--- a/htdocs/societe/class/api_thirdparties.class.php
+++ b/htdocs/societe/class/api_thirdparties.class.php
@@ -47,6 +47,10 @@ class Thirdparties extends DolibarrApi
     {
 		global $db, $conf;
 		$this->db = $db;
+
+		require_once DOL_DOCUMENT_ROOT.'/societe/class/societe.class.php';
+		require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
+
         $this->company = new Societe($this->db);
 
         if (! empty($conf->global->SOCIETE_MAIL_REQUIRED)) {