diff --git a/mashumaro/core/helpers.py b/mashumaro/core/helpers.py
index 73f5143a..bbd880f1 100644
--- a/mashumaro/core/helpers.py
+++ b/mashumaro/core/helpers.py
@@ -25,9 +25,6 @@ class ConfigValue:
     def __init__(self, name):
         self.name = name
 
-    def __class_getitem__(cls, name):
-        return ConfigValue(name)
-
 
 __all__ = [
     "parse_timezone",