diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..0859c5f
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,2 @@
+sphinx>=1.6.2  # BSD
+openstackdocstheme>=1.11.0 # Apache-2.0
diff --git a/setup.cfg b/setup.cfg
index c8eca7c..5117cfd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -36,9 +36,6 @@ test =
     requests-mock>=1.1 # Apache-2.0
     testrepository>=0.0.18 # Apache-2.0/BSD
     testscenarios>=0.4 # Apache-2.0/BSD
-doc =
-    sphinx>=1.6.2  # BSD
-    openstackdocstheme>=1.11.0 # Apache-2.0
 
 [entry_points]
 console_scripts =
diff --git a/tox.ini b/tox.ini
index 72f54bf..0c19ed2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ commands = flake8 {posargs}
 
 [testenv:venv]
 # Used by openstack-infra to build the doc
-deps = .[doc]
+deps = -r{toxinidir}/doc/requirements.txt
 commands = {posargs}
 
 [testenv:cover]
@@ -25,7 +25,7 @@ commands =
   coverage report
 
 [testenv:docs]
-deps = .[doc]
+deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf doc/source/ref
   python setup.py build_sphinx