diff --git a/test/hardback/all_test.py b/test/hardback/all_test.py
index a1deb92..5f402f5 100644
--- a/test/hardback/all_test.py
+++ b/test/hardback/all_test.py
@@ -1,5 +1,5 @@
 import import_all
 
 
-class ImportAllTest(import_all.TestCase):
+class ImportAllTest(import_all.ImportAllTest):
     pass