diff --git a/readthedocs/api/v2/views/footer_views.py b/readthedocs/api/v2/views/footer_views.py
index 09709ac1bb1..04d4fe8210b 100644
--- a/readthedocs/api/v2/views/footer_views.py
+++ b/readthedocs/api/v2/views/footer_views.py
@@ -25,12 +25,15 @@ def get_version_compare_data(project, base_version=None):
     :param base_version: We assert whether or not the base_version is also the
                          highest version in the resulting "is_highest" value.
     """
-    versions_qs = project.versions.public().filter(active=True)
+    versions_qs = Version.objects.public(project=project)
 
     # Take preferences over tags only if the project has at least one tag
     if versions_qs.filter(type=TAG).exists():
         versions_qs = versions_qs.filter(type=TAG)
 
+    # Optimization
+    versions_qs = versions_qs.select_related('project')
+
     highest_version_obj, highest_version_comparable = highest_version(
         versions_qs,
     )
diff --git a/readthedocs/core/views/serve.py b/readthedocs/core/views/serve.py
index 390063f256a..cd5ab8fdb64 100644
--- a/readthedocs/core/views/serve.py
+++ b/readthedocs/core/views/serve.py
@@ -202,7 +202,11 @@ def serve_docs(
     if not version_slug:
         version_slug = project.get_default_version()
     try:
-        version = project.versions.public(request.user).get(slug=version_slug)
+        version = (
+            Version.objects
+            .public(user=request.user, project=project)
+            .get(slug=version_slug)
+        )
     except Version.DoesNotExist:
         # Properly raise a 404 if the version doesn't exist (or is inactive) and
         # a 401 if it does
@@ -409,8 +413,10 @@ def changefreqs_generator():
 
         if project.translations.exists():
             for translation in project.translations.all():
-                translation_versions = translation.versions.public(
-                    ).values_list('slug', flat=True)
+                translation_versions = (
+                    Version.objects.public(project=translation)
+                    .values_list('slug', flat=True)
+                )
                 if version.slug in translation_versions:
                     href = project.get_docs_url(
                         version_slug=version.slug,
diff --git a/readthedocs/rtd_tests/tests/test_doc_serving.py b/readthedocs/rtd_tests/tests/test_doc_serving.py
index 134b191235c..4f6cb93990c 100644
--- a/readthedocs/rtd_tests/tests/test_doc_serving.py
+++ b/readthedocs/rtd_tests/tests/test_doc_serving.py
@@ -1,16 +1,16 @@
-
 import os
 
 import django_dynamic_fixture as fixture
 import mock
 from django.conf import settings
 from django.contrib.auth.models import User
-from django.http import Http404
+from django.http import Http404, HttpResponse
 from django.test import RequestFactory, TestCase
 from django.test.utils import override_settings
 from django.urls import reverse
 from mock import mock_open, patch
 
+from readthedocs.builds.constants import LATEST
 from readthedocs.builds.models import Version
 from readthedocs.core.middleware import SubdomainMiddleware
 from readthedocs.core.views import server_error_404_subdomain
@@ -293,3 +293,39 @@ def test_sitemap_xml(self):
         # hreflang should use hyphen instead of underscore
         # in language and country value. (zh_CN should be zh-CN)
         self.assertContains(response, 'zh-CN')
+
+    @override_settings(
+        PYTHON_MEDIA=True,
+        USE_SUBDOMAIN=False,
+    )
+    @patch(
+        'readthedocs.core.views.serve._serve_symlink_docs',
+        new=mock.MagicMock(return_value=HttpResponse(content_type='text/html')),
+    )
+    def test_user_with_multiple_projects_serve_from_same_domain(self):
+        project = fixture.get(
+            Project,
+            main_language_project=None,
+            users=[self.eric],
+        )
+        other_project = fixture.get(
+            Project,
+            main_language_project=None,
+            users=[self.eric],
+        )
+
+        # Trigger the save method of the versions
+        project.versions.get(slug=LATEST).save()
+        other_project.versions.get(slug=LATEST).save()
+
+        # Two projects of one owner with versions with the same slug
+        self.assertIn(self.eric, project.users.all())
+        self.assertIn(self.eric, other_project.users.all())
+        self.assertTrue(project.versions.filter(slug=LATEST).exists())
+        self.assertTrue(other_project.versions.filter(slug=LATEST).exists())
+
+        self.client.force_login(self.eric)
+        request = self.client.get(
+            f'/docs/{project.slug}/en/latest/'
+        )
+        self.assertEqual(request.status_code, 200)