diff --git a/django/contrib/contenttypes/models.py b/django/contrib/contenttypes/models.py
index 862284ac0c..6138f7b8c2 100644
--- a/django/contrib/contenttypes/models.py
+++ b/django/contrib/contenttypes/models.py
@@ -72,7 +72,7 @@ class ContentTypeManager(models.Manager):
         self.__class__._cache.setdefault(using, {})[ct.id] = ct
 
 class ContentType(models.Model):
-    id = models.NativeAutoField(primary_key=100)
+    id = models.NativeAutoField(primary_key=True)
     name = models.CharField(max_length=100)
     app_label = models.CharField(max_length=100)
     model = models.CharField(_('python model class name'), max_length=100)