diff --git a/redbot/core/config.py b/redbot/core/config.py
index 0eb729aca..85a8f1df5 100644
--- a/redbot/core/config.py
+++ b/redbot/core/config.py
@@ -392,7 +392,7 @@ class Group(Value):
             # is equivalent to
 
             data = {"foo": {"bar": None}}
-            d["foo"]["bar"] = "baz"
+            data["foo"]["bar"] = "baz"
 
         Parameters
         ----------