diff --git a/lang/ar/moodle.php b/lang/ar/moodle.php
index 4faf321befd..e638bae1e90 100644
--- a/lang/ar/moodle.php
+++ b/lang/ar/moodle.php
@@ -423,6 +423,7 @@ $string['thanks'] = "
 $string['theme'] = "الشكل";
 $string['themesaved'] = "تم حفظ الشكل الجديد";
 $string['thischarset'] = "windows-1256";
+$string['thisdirection'] = "rtl";
 $string['thislanguage'] = "Arabic";
 $string['timezone'] = "المنطقة الزمنية";
 $string['today'] = "اليوم";