diff --git a/stapler/cert_manager.py b/stapler/cert_manager.py
index e0513a6..42109d4 100644
--- a/stapler/cert_manager.py
+++ b/stapler/cert_manager.py
@@ -161,6 +161,7 @@ class CertManager:
                     "certonly",
                     "--non-interactive",
                     "--agree-tos",
+                    "--register-unsafely-without-email",
                     "--webroot",
                     "--webroot-path",
                     self.certbot_www,