diff --git a/src/rougail/cli/rougailconfig.py b/src/rougail/cli/rougailconfig.py
index d5b4254..6ca81d0 100644
--- a/src/rougail/cli/rougailconfig.py
+++ b/src/rougail/cli/rougailconfig.py
@@ -65,8 +65,10 @@ def from_yaml(cmd_config, yaml_file):
 def from_env(cmd_config, env_prefix):
     from rougail.user_data_environment import RougailUserDataEnvironment
     fake_rougail_config = {
+        "main_namespace": None,
         "step.user_data": ["environment"],
         "environment.default_environment_name": env_prefix,
+        "environment.custom_separator": None,
     }
     return RougailUserDataEnvironment(
             cmd_config,