diff --git a/src/rougail/user_data_environment/config.py b/src/rougail/user_data_environment/config.py
index 2ecda67..cc1b78e 100644
--- a/src/rougail/user_data_environment/config.py
+++ b/src/rougail/user_data_environment/config.py
@@ -43,9 +43,9 @@ environment:
     default: ROUGAIL
     validators:
       - jinja: |-
-          {{% if _.default_environment_name | upper != _.default_environment_name %}}
-            {_("should only user uppercase character")}
-          {{% endif %}}
+          {{{{ _.default_environment_name | upper != _.default_environment_name }}}}
+        return_type: boolean
+        description: {_("should only user uppercase character")}
     disabled:
       variable: __.main_namespace
       when_not: null