diff --git a/deploy-chatmail/src/deploy_chatmail/__init__.py b/deploy-chatmail/src/deploy_chatmail/__init__.py
index d1dd66fc..f8d39886 100644
--- a/deploy-chatmail/src/deploy_chatmail/__init__.py
+++ b/deploy-chatmail/src/deploy_chatmail/__init__.py
@@ -195,7 +195,7 @@ def _install_mta_sts_daemon() -> bool:
     server.shell(
         name="install postfix-mta-sts-resolver with pip",
         commands=[
-            "python3 -m venv /usr/local/lib/postfix-mta-sts-resolver",
+            "python3 -m virtualenv /usr/local/lib/postfix-mta-sts-resolver",
             "/usr/local/lib/postfix-mta-sts-resolver/bin/pip install postfix-mta-sts-resolver",
         ],
     )