diff --git a/filter.php b/filter.php
index 1d4503e..cbf602c 100644
--- a/filter.php
+++ b/filter.php
@@ -15,7 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
- * A Moodle text filter to enable multilangual content.
+ * A Moodle text filter to enable multilingual content.
  *
  * @package    filter_multilang2
  * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
@@ -24,8 +24,7 @@
  * @copyright  2015 onwards Iñaki Arenaza & Mondragon Unibertsitatea
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class filter_multilang2 extends \filter_multilang2\text_filter {
-    // The actual implementation in under classes/text_filter.php
-    // This file is just a workaround to make the filter work
-    // in Moodle versions below 4.5.
-}
+// The actual implementation is under classes/text_filter.php
+// This file is just a workaround to make the filter work
+// in Moodle versions below 4.5.
+class_alias(\filter_multilang2\text_filter::class, \filter_multilang2::class);