diff --git a/requirements-test.txt b/requirements-test.txt
index e079f8a..bbd486c 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1 +1,2 @@
 pytest
+types-pyyaml
diff --git a/swh/__init__.py b/swh/__init__.py
index f14e196..8d9f151 100644
--- a/swh/__init__.py
+++ b/swh/__init__.py
@@ -1,4 +1,4 @@
 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__ = extend_path(__path__, __name__)  # type: Iterable[str]
+__path__: List[str] = extend_path(__path__, __name__)
diff --git a/swh/objstorage/__init__.py b/swh/objstorage/__init__.py
index 65ddb5f..4a653ed 100644
--- a/swh/objstorage/__init__.py
+++ b/swh/objstorage/__init__.py
@@ -1,7 +1,7 @@
 from pkgutil import extend_path
-from typing import Iterable
+from typing import List
 
-__path__: Iterable[str] = extend_path(__path__, __name__)
+__path__: List[str] = extend_path(__path__, __name__)
 
 # for BW compat
 from swh.objstorage.factory import *  # noqa