diff --git a/tox.ini b/tox.ini
index 4944fdc96..f83f40891 100644
--- a/tox.ini
+++ b/tox.ini
@@ -243,7 +243,7 @@ commands =
 
 [testenv:integration-certbot-oldest]
 commands =
-    {[base]pip_install} .
+    {[base]pip_install} certbot
     {[base]pip_install} certbot-ci
     pytest certbot-ci/certbot_integration_tests/certbot_tests \
         --acme-server={env:ACME_SERVER:pebble}