diff --git a/tox.ini b/tox.ini
index 786da7225..b5424db1b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -258,7 +258,7 @@ commands =
 commands =
     {[base]pip_install} certbot-ci
     pytest certbot-ci/certbot_integration_tests \
-        --acme-server={env:ACME_SERVER:pebble} \
+        --acme-server={env:ACME_SERVER:pebble}
 passenv = DOCKER_*
 
 [testenv:integration-certbot-oldest]