diff --git a/tests/foreign_object/models.py b/tests/foreign_object/models.py
index d8c3bc10d4..fe74fae69a 100644
--- a/tests/foreign_object/models.py
+++ b/tests/foreign_object/models.py
@@ -153,7 +153,7 @@ class NewsArticle(Article):
 
 class ArticleTranslation(models.Model):
     article = models.ForeignKey(Article)
-    lang = models.CharField(max_length='2')
+    lang = models.CharField(max_length=2)
     title = models.CharField(max_length=100)
     body = models.TextField()
     abstract = models.CharField(max_length=400, null=True)