diff --git a/lib/Tmdb/Model/Common/SpokenLanguage.php b/lib/Tmdb/Model/Common/SpokenLanguage.php
index eea54f75..16f67481 100644
--- a/lib/Tmdb/Model/Common/SpokenLanguage.php
+++ b/lib/Tmdb/Model/Common/SpokenLanguage.php
@@ -25,7 +25,7 @@ class SpokenLanguage extends AbstractModel implements LanguageFilter
     private $name;
 
     public static $properties = [
-        'iso_369_1',
+        'iso_639_1',
         'name',
     ];