diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index f868347960..629afa29e7 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -389,7 +389,7 @@ class BaseQuery(object):
                 # other than MySQL), then any fields mentioned in the
                 # ordering clause needs to be in the group by clause.
                 if not self.connection.features.allows_group_by_pk:
-                    grouping.extend([col for col in ordering_group_by
+                    grouping.extend([str(col) for col in ordering_group_by
                         if col not in grouping])
             else:
                 ordering = self.connection.ops.force_no_ordering()
diff --git a/tests/regressiontests/aggregation_regress/models.py b/tests/regressiontests/aggregation_regress/models.py
index 51648dada6..de913a0a9f 100644
--- a/tests/regressiontests/aggregation_regress/models.py
+++ b/tests/regressiontests/aggregation_regress/models.py
@@ -213,6 +213,10 @@ FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, conta
 >>> books.all()
 [<Book: Artificial Intelligence: A Modern Approach>, <Book: Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp>, <Book: Practical Django Projects>, <Book: Python Web Development with Django>, <Book: Sams Teach Yourself Django in 24 Hours>, <Book: The Definitive Guide to Django: Web Development Done Right>]
 
+# Regression for #10248 - Annotations work with DateQuerySets
+>>> Book.objects.annotate(num_authors=Count('authors')).filter(num_authors=2).dates('pubdate', 'day')
+[datetime.datetime(1995, 1, 15, 0, 0), datetime.datetime(2007, 12, 6, 0, 0)]
+
 """
 }