diff --git a/tests/roots/test-numfig/conf.py b/tests/roots/test-numfig/conf.py
index f81c30bc4..cf05c9b5c 100644
--- a/tests/roots/test-numfig/conf.py
+++ b/tests/roots/test-numfig/conf.py
@@ -1,3 +1,4 @@
 # -*- coding: utf-8 -*-
 
 master_doc = 'index'
+html_theme = 'classic'
diff --git a/tests/roots/test-tocdepth/conf.py b/tests/roots/test-tocdepth/conf.py
index f81c30bc4..cf05c9b5c 100644
--- a/tests/roots/test-tocdepth/conf.py
+++ b/tests/roots/test-tocdepth/conf.py
@@ -1,3 +1,4 @@
 # -*- coding: utf-8 -*-
 
 master_doc = 'index'
+html_theme = 'classic'
diff --git a/tests/test_theming.py b/tests/test_theming.py
index 931f48468..77a8b5d8f 100644
--- a/tests/test_theming.py
+++ b/tests/test_theming.py
@@ -26,7 +26,7 @@ def test_theme_api(app, status, warning):
     assert set(Theme.themes.keys()) == \
         set(['basic', 'default', 'scrolls', 'agogo', 'sphinxdoc', 'haiku',
              'traditional', 'testtheme', 'ziptheme', 'epub', 'nature',
-             'pyramid', 'bizstyle'])
+             'pyramid', 'bizstyle', 'classic'])
     assert Theme.themes['testtheme'][1] is None
     assert isinstance(Theme.themes['ziptheme'][1], zipfile.ZipFile)