diff --git a/tox.ini b/tox.ini
index f189fa77..4f968ea5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,6 +9,8 @@ setenv = VIRTUAL_ENV={envdir}
 passenv = *_proxy *_PROXY ZUUL_*
 
 [testenv:docs]
+setenv =
+  SPHINX_WARNINGS_TRANS=1
 deps =
   -r{toxinidir}/doc/requirements.txt
 commands =