diff --git a/tox.ini b/tox.ini
index b13eabd1a..5803f62e8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,11 @@ envlist =
        docs
 
 [testenv]
-commands = python -W error::DeprecationWarning -W error::PendingDeprecationWarning runtests.py --coverage {posargs}
+commands =
+    python -W error::DeprecationWarning \
+           -W "ignore:'cgi' is deprecated:DeprecationWarning" \
+           -W error::PendingDeprecationWarning \
+           runtests.py --coverage {posargs}
 envdir = {toxworkdir}/venvs/{envname}
 setenv =
        PYTHONDONTWRITEBYTECODE=1