diff --git a/django/models/auth.py b/django/models/auth.py
index 63e879fdea8..cd17194339d 100644
--- a/django/models/auth.py
+++ b/django/models/auth.py
@@ -232,7 +232,6 @@ class Session(meta.Model):
 
 class Message(meta.Model):
     fields = (
-        meta.AutoField('id', 'ID', primary_key=True),
         meta.ForeignKey(User),
         meta.TextField('message', 'message'),
     )