diff --git a/koerce/annots.py b/koerce/annots.py
index 092a787..3c3a8ca 100644
--- a/koerce/annots.py
+++ b/koerce/annots.py
@@ -838,7 +838,7 @@ def __call__(cls, *args, **kwargs):
 class Singleton(Abstract):
     """Cache instances of the class based on instantiation arguments."""
 
-    __instances__: Mapping[Any, Self] = WeakValueDictionary()
+    __instances__: Mapping[Any, typing.Self] = WeakValueDictionary()
     __slots__ = ("__weakref__",)