diff --git a/htdocs/core/modules/mailings/contacts1.modules.php b/htdocs/core/modules/mailings/contacts1.modules.php
index 83e9e3ff277..9a9be018b79 100644
--- a/htdocs/core/modules/mailings/contacts1.modules.php
+++ b/htdocs/core/modules/mailings/contacts1.modules.php
@@ -120,7 +120,7 @@ class mailing_contacts1 extends MailingTargets
 	 */
 	public function formFilter()
 	{
-		global $langs;
+		global $conf,$langs;
 
 		// Load translation files required by the page
 		$langs->loadLangs(array("commercial", "companies", "suppliers", "categories"));
@@ -305,11 +305,13 @@ class mailing_contacts1 extends MailingTargets
 
 		$s .= ajax_combobox("filter_category_supplier_contact");
 
-		// Choose language
-		require_once DOL_DOCUMENT_ROOT.'/core/class/html.formadmin.class.php';
-		$formadmin = new FormAdmin($this->db);
-		$s .= '<span class="opacitymedium">'.$langs->trans("DefaultLang").':</span> ';
-		$s .= $formadmin->select_language($langs->getDefaultLang(1), 'filter_lang', 0, 0, 1, 0, 0, '', 0, 0, 0, null, 1);
+		if (getDolGlobalInt('MAIN_MULTILANGS')) {
+			// Choose language
+			require_once DOL_DOCUMENT_ROOT.'/core/class/html.formadmin.class.php';
+			$formadmin = new FormAdmin($this->db);
+			$s .= '<span class="opacitymedium">'.$langs->trans("DefaultLang").':</span> ';
+			$s .= $formadmin->select_language($langs->getDefaultLang(1), 'filter_lang_thirdparties', 0, null, 1, 0, 0, '', 0, 0, 0, null, 1);
+		}
 
 		return $s;
 	}