diff --git a/tests/regressiontests/aggregation_regress/models.py b/tests/regressiontests/aggregation_regress/models.py
index dd4ff50aec0..b857ba62ac7 100644
--- a/tests/regressiontests/aggregation_regress/models.py
+++ b/tests/regressiontests/aggregation_regress/models.py
@@ -1,4 +1,6 @@
 # coding: utf-8
+from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
 
@@ -22,6 +24,13 @@ class Publisher(models.Model):
         return self.name
 
 
+class TaggedItem(models.Model):
+    tag = models.CharField(max_length=100)
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    content_object = generic.GenericForeignKey('content_type', 'object_id')
+
+
 @python_2_unicode_compatible
 class Book(models.Model):
     isbn = models.CharField(max_length=9)
@@ -33,6 +42,7 @@ class Book(models.Model):
     contact = models.ForeignKey(Author, related_name='book_contact_set')
     publisher = models.ForeignKey(Publisher)
     pubdate = models.DateField()
+    tags = generic.GenericRelation(TaggedItem)
 
     class Meta:
         ordering = ('name',)
@@ -63,6 +73,14 @@ class Clues(models.Model):
     Clue = models.CharField(max_length=150)
 
 
+class WithManualPK(models.Model):
+    # The generic relations regression test needs two different model
+    # classes with the same PK value, and there are some (external)
+    # DB backends that don't work nicely when assigning integer to AutoField
+    # column (MSSQL at least).
+    id = models.IntegerField(primary_key=True)
+
+
 @python_2_unicode_compatible
 class HardbackBook(Book):
     weight = models.FloatField()
diff --git a/tests/regressiontests/aggregation_regress/tests.py b/tests/regressiontests/aggregation_regress/tests.py
index 076567538b8..94a02cf3b5c 100644
--- a/tests/regressiontests/aggregation_regress/tests.py
+++ b/tests/regressiontests/aggregation_regress/tests.py
@@ -6,11 +6,13 @@ from decimal import Decimal
 from operator import attrgetter
 
 from django.core.exceptions import FieldError
+from django.contrib.contenttypes.models import ContentType
 from django.db.models import Count, Max, Avg, Sum, StdDev, Variance, F, Q
 from django.test import TestCase, Approximate, skipUnlessDBFeature
 from django.utils import six
 
-from .models import Author, Book, Publisher, Clues, Entries, HardbackBook
+from .models import (Author, Book, Publisher, Clues, Entries, HardbackBook,
+        TaggedItem, WithManualPK)
 
 
 class AggregationTests(TestCase):
@@ -982,3 +984,39 @@ class AggregationTests(TestCase):
     def test_reverse_join_trimming(self):
         qs = Author.objects.annotate(Count('book_contact_set__contact'))
         self.assertIn(' JOIN ', str(qs.query))
+
+    def test_aggregation_with_generic_reverse_relation(self):
+        """
+        Regression test for #10870:  Aggregates with joins ignore extra
+        filters provided by setup_joins
+
+        tests aggregations with generic reverse relations
+        """
+        b = Book.objects.get(name='Practical Django Projects')
+        TaggedItem.objects.create(object_id=b.id, tag='intermediate',
+                content_type=ContentType.objects.get_for_model(b))
+        TaggedItem.objects.create(object_id=b.id, tag='django',
+                content_type=ContentType.objects.get_for_model(b))
+        # Assign a tag to model with same PK as the book above. If the JOIN
+        # used in aggregation doesn't have content type as part of the
+        # condition the annotation will also count the 'hi mom' tag for b.
+        wmpk = WithManualPK.objects.create(id=b.pk)
+        TaggedItem.objects.create(object_id=wmpk.id, tag='hi mom',
+                content_type=ContentType.objects.get_for_model(wmpk))
+        b = Book.objects.get(name__startswith='Paradigms of Artificial Intelligence')
+        TaggedItem.objects.create(object_id=b.id, tag='intermediate',
+                content_type=ContentType.objects.get_for_model(b))
+
+        self.assertEqual(Book.objects.aggregate(Count('tags')), {'tags__count': 3})
+        results = Book.objects.annotate(Count('tags')).order_by('-tags__count', 'name')
+        self.assertEqual(
+            [(b.name, b.tags__count) for b in results],
+            [
+                ('Practical Django Projects', 2),
+                ('Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', 1),
+                ('Artificial Intelligence: A Modern Approach', 0),
+                ('Python Web Development with Django', 0),
+                ('Sams Teach Yourself Django in 24 Hours', 0),
+                ('The Definitive Guide to Django: Web Development Done Right', 0)
+            ]
+        )