diff --git a/tox.ini b/tox.ini
index c01f513..7e3f601 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,9 +2,10 @@
 envlist=flake8,mypy,py3
 
 [testenv]
+extras =
+  testing
 deps =
   swh.core[http] >= 0.0.61
-  .[testing]
   pytest-cov
   dev: ipdb
 commands =
@@ -20,9 +21,9 @@ commands =
   {envpython} -m flake8
 
 [testenv:mypy]
-skip_install = true
+extras =
+  testing
 deps =
-  .[testing]
   mypy
 commands =
   mypy swh