diff --git a/src/wagtail_personalisation/models.py b/src/wagtail_personalisation/models.py
index 8901dbd..d85fb8f 100644
--- a/src/wagtail_personalisation/models.py
+++ b/src/wagtail_personalisation/models.py
@@ -1,12 +1,9 @@
-from __future__ import absolute_import, unicode_literals
-
 import random
 
 from django import forms
 from django.conf import settings
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models, transaction
-from django.db.models import F
 from django.template.defaultfilters import slugify
 from django.utils.encoding import python_2_unicode_compatible
 from django.utils.functional import cached_property
@@ -201,16 +198,6 @@ class Segment(ClusterableModel):
         return False
 
 
-class PersonalisablePageManager(models.Manager):
-
-    def canonicals(self):
-        return (
-            self.filter(
-                personalisable_canonical_metadata__canonical_page_id=F(
-                    'personalisable_canonical_metadata__variant__id'))
-        )
-
-
 class PersonalisablePageMetadata(ClusterableModel):
     """The personalisable page model. Allows creation of variants with linked
     segments.
@@ -231,8 +218,6 @@ class PersonalisablePageMetadata(ClusterableModel):
         on_delete=models.SET_NULL,
         null=True, blank=True)
 
-    objects = PersonalisablePageManager()
-
     @cached_property
     def has_variants(self):
         """Return a boolean indicating whether or not the personalisable page
diff --git a/src/wagtail_personalisation/utils.py b/src/wagtail_personalisation/utils.py
index 59a1246..631424a 100644
--- a/src/wagtail_personalisation/utils.py
+++ b/src/wagtail_personalisation/utils.py
@@ -1,5 +1,6 @@
 import time
 
+from django.db.models import F
 from django.template.base import FilterExpression, kwarg_re
 from django.utils import timezone
 
@@ -103,4 +104,6 @@ def exclude_variants(pages):
     :return: Queryset of pages that aren't variants
     :rtype: QuerySet
     """
-    return pages.canonicals()
+    return pages.filter(
+        personalisable_canonical_metadata__canonical_page_id=F(
+            'personalisable_canonical_metadata__variant__id'))
diff --git a/tests/factories/page.py b/tests/factories/page.py
index 85ba4f2..c0bad88 100644
--- a/tests/factories/page.py
+++ b/tests/factories/page.py
@@ -8,6 +8,7 @@ from tests.site.pages import models
 
 
 class ContentPageFactory(PageFactory):
+    parent = None
     title = 'Test page'
     slug = factory.LazyAttribute(lambda obj: slugify(obj.title))
 
diff --git a/tests/site/pages/models.py b/tests/site/pages/models.py
index 28f1702..6c40d92 100644
--- a/tests/site/pages/models.py
+++ b/tests/site/pages/models.py
@@ -1,5 +1,3 @@
-from __future__ import absolute_import, unicode_literals
-
 from django.db import models
 from wagtail.admin.edit_handlers import FieldPanel
 from wagtail.core.fields import RichTextField
diff --git a/tests/unit/test_models.py b/tests/unit/test_models.py
index 078240b..3f1e886 100644
--- a/tests/unit/test_models.py
+++ b/tests/unit/test_models.py
@@ -5,7 +5,9 @@ import datetime
 import pytest
 
 from tests.factories.segment import SegmentFactory
+from tests.factories.page import ContentPageFactory
 from wagtail_personalisation.rules import TimeRule
+from tests.site.pages import models
 
 
 @pytest.mark.django_db
@@ -25,3 +27,10 @@ def test_metadata_page_has_variants(segmented_page):
     canonical = segmented_page.personalisation_metadata.canonical_page
     assert canonical.personalisation_metadata.is_canonical
     assert canonical.personalisation_metadata.has_variants
+
+
+@pytest.mark.django_db
+def test_content_page_model():
+    page = ContentPageFactory()
+    qs = models.ContentPage.objects.all()
+    assert page in qs