diff --git a/fastapi/types.py b/fastapi/types.py
index 7adf565a7..3205654c7 100644
--- a/fastapi/types.py
+++ b/fastapi/types.py
@@ -6,6 +6,5 @@ from pydantic import BaseModel
 
 DecoratedCallable = TypeVar("DecoratedCallable", bound=Callable[..., Any])
 UnionType = getattr(types, "UnionType", Union)
-NoneType = getattr(types, "UnionType", None)
 ModelNameMap = Dict[Union[Type[BaseModel], Type[Enum]], str]
 IncEx = Union[Set[int], Set[str], Dict[int, Any], Dict[str, Any]]