diff --git a/marshmallow_dataclass/__init__.py b/marshmallow_dataclass/__init__.py
index f2014af..c7b1e0a 100644
--- a/marshmallow_dataclass/__init__.py
+++ b/marshmallow_dataclass/__init__.py
@@ -48,6 +48,7 @@ class User:
     Dict,
     List,
     Mapping,
+    NewType as typing_NewType,
     Optional,
     Set,
     Tuple,
@@ -805,12 +806,8 @@ def NewType(
     marshmallow.exceptions.ValidationError: {'mail': ['Not a valid email address.']}
     """
 
-    def new_type(x: _U):
-        return x
-
-    new_type.__name__ = name
     # noinspection PyTypeHints
-    new_type.__supertype__ = typ  # type: ignore
+    new_type = typing_NewType(name, typ)  # type: ignore
     # noinspection PyTypeHints
     new_type._marshmallow_field = field  # type: ignore
     # noinspection PyTypeHints