diff --git a/stdlib/3/collections/__init__.pyi b/stdlib/3/collections/__init__.pyi
index 9c9f0cb0a..6672d434c 100644
--- a/stdlib/3/collections/__init__.pyi
+++ b/stdlib/3/collections/__init__.pyi
@@ -65,7 +65,7 @@ else:
 _UserDictT = TypeVar('_UserDictT', bound=UserDict)
 
 class UserDict(MutableMapping[_KT, _VT]):
-    data: Mapping[_KT, _VT]
+    data: Dict[_KT, _VT]
     def __init__(self, dict: Optional[Mapping[_KT, _VT]] = ..., **kwargs: _VT) -> None: ...
     def __len__(self) -> int: ...
     def __getitem__(self, key: _KT) -> _VT: ...