diff --git a/letsencrypt/plugins/manual.py b/letsencrypt/plugins/manual.py
index 7f782a41b..29f4639fe 100644
--- a/letsencrypt/plugins/manual.py
+++ b/letsencrypt/plugins/manual.py
@@ -91,6 +91,8 @@ s.serve_forever()" """
             help="Automatically allows public IP logging.")
 
     def prepare(self):  # pylint: disable=missing-docstring,no-self-use
+        if self.config.noninteractive_mode:
+            raise errors.PluginError("Running manual mode non-interactively is not supported")
         pass  # pragma: no cover
 
     def more_info(self):  # pylint: disable=missing-docstring,no-self-use