Index: contrib/admin/models.py
===================================================================
--- contrib/admin/models.py	(revision 6038)
+++ contrib/admin/models.py	(working copy)
@@ -17,7 +17,7 @@
     action_time = models.DateTimeField(_('action time'), auto_now=True)
     user = models.ForeignKey(User)
     content_type = models.ForeignKey(ContentType, blank=True, null=True)
-    object_id = models.TextField(_('object id'), blank=True, null=True)
+    object_id = models.CharField(_('object id'), blank=True, null=True, max_length=255)
     object_repr = models.CharField(_('object repr'), max_length=200)
     action_flag = models.PositiveSmallIntegerField(_('action flag'))
     change_message = models.TextField(_('change message'), blank=True)