diff --git a/fimfarchive/stampers.py b/fimfarchive/stampers.py
index 62bd7a6..ba7f4bb 100644
--- a/fimfarchive/stampers.py
+++ b/fimfarchive/stampers.py
@@ -27,6 +27,11 @@ from typing import Any, Dict
 from fimfarchive.stories import Story
 
 
+__all__ = (
+    'Stamper',
+)
+
+
 class Stamper:
     """
     Adds archive-related information to stories.
diff --git a/tests/test_imports.py b/tests/test_imports.py
index 7501661..ef3d234 100644
--- a/tests/test_imports.py
+++ b/tests/test_imports.py
@@ -33,6 +33,7 @@ MODULES = (
     'mappers',
     'selectors',
     'signals',
+    'stampers',
     'stories',
     'tasks',
     'utils',