diff --git a/swh/__init__.py b/swh/__init__.py
index 8d9f151..b36383a 100644
--- a/swh/__init__.py
+++ b/swh/__init__.py
@@ -1,4 +1,3 @@
 from pkgutil import extend_path
-from typing import List
 
-__path__: List[str] = extend_path(__path__, __name__)
+__path__ = extend_path(__path__, __name__)
diff --git a/tox.ini b/tox.ini
index 7c99df6..0196f7f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,32 +1,32 @@
 [tox]
 envlist=flake8,mypy,py3
 
 [testenv:py3]
 deps =
   pytest-cov
 commands =
   pytest --cov=swh --cov-branch {posargs}
 
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8
 
 
 [testenv:flake8-phab]
 skip_install = true
 deps =
   flake8
   git+https://framagit.org/douardda/flake8-phabricator-formatter.git
 commands =
   {envpython} -m flake8 --format=phabricator --output-file=.phabricator-lint
 
 [testenv:mypy]
 extras =
   testing
 deps =
-  mypy
+  mypy==0.920
 commands =
   mypy swh