diff --git a/vllm/utils.py b/vllm/utils.py
index 65b26ebb9a44f..04e48bfb6b645 100644
--- a/vllm/utils.py
+++ b/vllm/utils.py
@@ -1657,9 +1657,9 @@ def __len__(self):
         return len(self._factory)
 
 
-class ClassRegistry(UserDict[type[T], _V]):
+class ClassRegistry(UserDict[Type[T], _V]):
 
-    def __getitem__(self, key: type[T]) -> _V:
+    def __getitem__(self, key: Type[T]) -> _V:
         for cls in key.mro():
             if cls in self.data:
                 return self.data[cls]