diff --git a/htdocs/core/modules/mailings/contacts1.modules.php b/htdocs/core/modules/mailings/contacts1.modules.php
index 38a82907124..09595b61376 100644
--- a/htdocs/core/modules/mailings/contacts1.modules.php
+++ b/htdocs/core/modules/mailings/contacts1.modules.php
@@ -122,7 +122,7 @@ class mailing_contacts1 extends MailingTargets
 	 */
 	public function formFilter()
 	{
-		global $langs;
+		global $langs,$conf;
 
 		// Load translation files required by the page
 		$langs->loadLangs(array("commercial", "companies", "suppliers", "categories"));
@@ -307,11 +307,14 @@ 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);
+		// Choose language if multilangue active
+
+		if (@$conf->global->MAIN_MULTILANGS==1) {
+			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);
+		}
 
 		return $s;
 	}
@@ -409,7 +412,7 @@ class mailing_contacts1 extends MailingTargets
 
 		// Filter on language
 		if (!empty($filter_lang)) {
-			$sql .= " AND sp.default_lang = '".$this->db->escape($filter_lang)."'";
+			$sql .= " AND sp.default_lang LIKE '".$this->db->escape($filter_lang)."%'";
 		}
 
 		// Filter on nature
diff --git a/htdocs/core/modules/mailings/thirdparties.modules.php b/htdocs/core/modules/mailings/thirdparties.modules.php
index 89bc2cf2b5e..81a9bfaea51 100644
--- a/htdocs/core/modules/mailings/thirdparties.modules.php
+++ b/htdocs/core/modules/mailings/thirdparties.modules.php
@@ -316,12 +316,13 @@ class mailing_thirdparties extends MailingTargets
 		$s .= '</select>';
 		$s .= ajax_combobox("filter_status_thirdparties");
 
-		// 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);
-
+		// Choose language if multilangue active
+		if (@$conf->global->MAIN_MULTILANGS==1) {
+			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;
 	}