diff --git a/tox.ini b/tox.ini
index 870f88c..83b868a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,35 +1,28 @@
 [tox]
 envlist=flake8,mypy,py3
 
-[testenv:py3]
+[testenv]
 deps =
   swh.core[http]
   .[testing]
   pytest-cov
+  dev: ipdb
 commands =
-  pytest --cov={envsitepackagesdir}/swh/loader/ --cov-branch \
+  pytest \
+  !dev: --cov={envsitepackagesdir}/swh/loader/ --cov-branch \
          {envsitepackagesdir}/swh/loader/ {posargs}
 
-[testenv:py3-dev]
-deps =
-  swh.core[http]
-  .[testing]
-  pytest-cov
-  ipdb
-commands =
-  pytest {envsitepackagesdir}/swh/loader/ {posargs}
-
 [testenv:flake8]
 skip_install = true
 deps =
   flake8
 commands =
   {envpython} -m flake8
 
 [testenv:mypy]
 skip_install = true
 deps =
   .[testing]
   mypy
 commands =
   mypy swh