diff --git a/test-requirements.txt b/test-requirements.txt
index aa891f5c..26506036 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,4 +10,5 @@ hacking<0.11,>=0.10.0
 pylint==1.4.5 # GNU GPL v2
 
 reno>=1.6.2 # Apache2
-oslosphinx!=3.4.0,>=2.5.0 # Apache-2.0
+oslosphinx>=2.5.0,!=3.4.0  # Apache-2.0
+sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3  # BSD
diff --git a/tox.ini b/tox.ini
index 5c4eaa27..76f2095f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,6 +32,9 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 [testenv:venv]
 commands = {posargs}
 
+[testenv:docs]
+commands = python setup.py build_sphinx
+
 [flake8]
 # H803 skipped on purpose per list discussion.
 # E123, E125 skipped as they are invalid PEP-8.