diff --git a/htdocs/core/class/conf.class.php b/htdocs/core/class/conf.class.php
index 63b07830f40..c3e525cd2ab 100644
--- a/htdocs/core/class/conf.class.php
+++ b/htdocs/core/class/conf.class.php
@@ -449,7 +449,7 @@ class Conf
 		if (! isset($this->global->MAIN_MODULES_FOR_EXTERNAL)) $this->global->MAIN_MODULES_FOR_EXTERNAL='user,askpricesupplier,facture,categorie,commande,fournisseur,contact,propal,projet,contrat,societe,ficheinter,expedition,agenda,adherent';	// '' means 'all'. Note that contact is added here as it should be a module later.
 
 		// Enable select2
-		if (empty($this->global->MAIN_USE_JQUERY_MULTISELECT)) $this->global->MAIN_USE_JQUERY_MULTISELECT='select2';
+		if (empty($this->global->MAIN_USE_JQUERY_MULTISELECT) || $this->global->MAIN_USE_JQUERY_MULTISELECT == '1') $this->global->MAIN_USE_JQUERY_MULTISELECT='select2';
 
 		// Timeouts
         if (empty($this->global->MAIN_USE_CONNECT_TIMEOUT)) $this->global->MAIN_USE_CONNECT_TIMEOUT=10;