diff --git a/tests/generic_relations_regress/tests.py b/tests/generic_relations_regress/tests.py
index 0c62283f01..1d89b6cd16 100644
--- a/tests/generic_relations_regress/tests.py
+++ b/tests/generic_relations_regress/tests.py
@@ -228,9 +228,11 @@ class GenericRelationTests(TestCase):
         self.assertEqual(qs.filter(links__sum__isnull=False).count(), 0)
 
     def test_filter_targets_related_pk(self):
-        HasLinkThing.objects.create()
-        hs2 = HasLinkThing.objects.create()
-        link = Link.objects.create(content_object=hs2)
+        # Use hardcoded PKs to ensure different PKs for "link" and "hs2"
+        # objects.
+        HasLinkThing.objects.create(pk=1)
+        hs2 = HasLinkThing.objects.create(pk=2)
+        link = Link.objects.create(content_object=hs2, pk=1)
         self.assertNotEqual(link.object_id, link.pk)
         self.assertSequenceEqual(HasLinkThing.objects.filter(links=link.pk), [hs2])