diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index 0705d2fd60d..ac866d1213c 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -589,6 +589,8 @@ class Conf
 		    $conf->global->AGENDA_DEFAULT_FILTER_TYPE='0';    // 'AC_NON_AUTO' does not exists when AGENDA_DEFAULT_FILTER_TYPE is not on.
 		}
 
+		if (! isset($this->global->MAIN_EXTRAFIELDS_IN_ONE_TD)) $this->global->MAIN_EXTRAFIELDS_IN_ONE_TD = 1;
+
 		$conf->global->MAIN_MODULE_DOLISTORE_API_SRV='https://www.dolistore.com';
 		$conf->global->MAIN_MODULE_DOLISTORE_API_KEY='dolistorecatalogpublickey1234567';