diff --git a/swh/objstorage/multiplexer/__init__.py b/swh/objstorage/multiplexer/__init__.py
index 3b9be11..09f8b18 100644
--- a/swh/objstorage/multiplexer/__init__.py
+++ b/swh/objstorage/multiplexer/__init__.py
@@ -1,4 +1,4 @@
 from .multiplexer_objstorage import MultiplexerObjStorage
 
 
-__all__ = [MultiplexerObjStorage]
+__all__ = ['MultiplexerObjStorage']