diff --git a/tox.ini b/tox.ini
index 442032453e34f2709bb558b33d7385510e445f0d..8fe8833bac14750797895b11a1f4968dae05f0a5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,9 @@
 [tox]
 envlist=flake8
 
+[testenv]
+basepython = python3
+
 [testenv:sphinx]
 deps =
   django < 2
@@ -12,7 +15,7 @@ commands =
 [testenv:sphinx-dev]
 deps =
   django < 2
-  -r requirements-swh-dev.txt
+  -rrequirements-swh-dev.txt
   pifpaf
 commands =
   {envpython} -m pifpaf run postgresql -- make -C docs html