diff --git a/tox.ini b/tox.ini
index d05e4160711aaa3011085233aa8e5793e78460e3..3a9fb9947dd51df5d62b982954c5fbf3fa114181 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,14 +1,19 @@
 [tox]
 skip_missing_interpreters = True
-envlist = clean, lint, py35, py36, integration, stats
+envlist = clean, lint, py35, py36, unit, integration, stats
 
 [travis]
 python =
-    3.5: lint, py35, integration
+    3.5: lint, py35, unit, integration
     3.6: py36, integration
 
 [testenv]
+# install_command can be removed when --process-dependency-links is not
+# needed anymore, and this section uncommented
 install_command = pip install --process-dependency-links {opts} {packages}
+
+
+[testenv:unit]
 deps = .[test]
 commands =
     coverage run -a --rcfile={toxinidir}/.coveragerc --source=sbws -m pytest \