diff --git a/src/dependency_injector/wiring.py b/src/dependency_injector/wiring.py
index 64439c25..c2f2cb16 100644
--- a/src/dependency_injector/wiring.py
+++ b/src/dependency_injector/wiring.py
@@ -118,7 +118,14 @@ def _patch_with_injections(fn, injections):
     return _patched
 
 
-class ConfigurationOption:
+class ConfigurationOptionMeta(type):
+
+    def __getitem__(cls, item):
+        # Spike for Python 3.6
+        return cls(item)
+
+
+class ConfigurationOption(metaclass=ConfigurationOptionMeta):
     """Configuration option marker."""
 
     def __init__(self, selector: str):
@@ -126,8 +133,3 @@ class ConfigurationOption:
 
     def __class_getitem__(cls, item):
         return cls(item)
-
-    @classmethod
-    def __getitem__(cls, item):
-        # Spike for Python 3.6
-        return cls(item)