diff --git a/tox.ini b/tox.ini
index 5b804b1ab..7a750294e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,6 +42,7 @@ basepython = python3
 commands = {posargs}
 
 [testenv:docs]
+usedevelop = True
 basepython = python3
 deps =
        -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}