diff --git a/swh/loader/package/loader.py b/swh/loader/package/loader.py
--- a/swh/loader/package/loader.py
+++ b/swh/loader/package/loader.py
@@ -913,7 +913,7 @@
             package_name = ".".join(module_name_parts[0:prefix_size])
             module = sys.modules[package_name]
             if hasattr(module, "__version__"):
-                return module.__version__
+                return module.__version__  # type: ignore
 
         # If this loader's class has no parent package with a __version__,
         # it should implement it itself.