diff --git a/plugins/modules/config.py b/plugins/modules/config.py
index 63d32f3..f096f2c 100644
--- a/plugins/modules/config.py
+++ b/plugins/modules/config.py
@@ -93,7 +93,7 @@ def iter_system(module, tree=None, value=None):
     changed = False
     # Recursively iterate the options tree
     for k, v in value.items():
-        sublist = tree + [k]
+        subtree = tree + [k]
         if isinstance(v, dict):
             changed = changed or iter_system(module, subtree, v)
             continue