diff --git a/src/rougail/user-data-environment/data.py b/src/rougail/user-data-environment/data.py
index cf10a72..0df105c 100644
--- a/src/rougail/user-data-environment/data.py
+++ b/src/rougail/user-data-environment/data.py
@@ -80,8 +80,9 @@ class RougailUserDataEnvironment:
         #
         option_name = option.path()
         # this is used only for warning purposes
-        if option_name in unused_environment_var:
-            self.unused_environment_var.remove(option_name)
+        if option_name not in unused_environment_var:
+            return
+        self.unused_environment_var.remove(option_name)
         # let's parse the environment variables values
         option_bash_value = get_rougail_environment_dict()[option_name]
         if ismulti: