diff --git a/src/marshmallow_oneofschema/__init__.py b/src/marshmallow_oneofschema/__init__.py
index 62413dd..be45bd1 100644
--- a/src/marshmallow_oneofschema/__init__.py
+++ b/src/marshmallow_oneofschema/__init__.py
@@ -1 +1,3 @@
 from .one_of_schema import OneOfSchema  # noqa
+
+__all__ = ("OneOfSchema",)