diff --git a/tox.ini b/tox.ini
index 6b710906e..1ad33dc27 100644
--- a/tox.ini
+++ b/tox.ini
@@ -177,6 +177,8 @@ commands =
     {toxinidir}/certbot-apache/certbot_apache/_internal/tests/apache-conf-files/apache-conf-test --debian-modules
 passenv =
     SERVER
+allowlist_externals =
+    {toxinidir}/certbot-apache/certbot_apache/_internal/tests/apache-conf-files/apache-conf-test
 
 [testenv:apacheconftest-external-with-pebble]
 description = Run apacheconftest with pebble and Certbot outside of the tox virtual environment.