diff --git a/tox.ini b/tox.ini
index 1fbab86..f086a50 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ envlist = py27,pypy,py34,py35,py36,py27-zodb,pypy-zodb,py27-pure-zodb,docs,cover
 commands =
     zope-testrunner --test-path=src []
 deps =
-    .[test,docs]
+    .[test]
 
 [testenv:py27-zodb]
 basepython =
@@ -47,3 +47,5 @@ basepython =
     python2.7
 commands =
     sphinx-build -b html -d docs/_build/doctrees docs docs/_build/html
+deps =
+    .[docs]