diff --git a/tox.ini b/tox.ini
index fc58538..757d434 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ envlist =
     pypy,
     coverage-report,
     isort,
-    docs
+    docs,
 skip_missing_interpreters = False
 
 [testenv]
@@ -72,6 +72,7 @@ commands = flake8 --doctests src tests setup.py
 [testenv:docs]
 basepython = python2.7
 commands =
-    sphinx-build -b html -d build/docs/build/doctrees docs build/docs/html
+    sphinx-build -b html -d build/docs/doctrees docs build/docs/html
 deps =
     .[docs]
+    Sphinx
\ No newline at end of file