diff --git a/promise/promise.py b/promise/promise.py
index <HASH>..<HASH> 100644
--- a/promise/promise.py
+++ b/promise/promise.py
@@ -818,7 +818,7 @@ class Promise(Generic[T]):
         )
 
 
-_type_done_callbacks = WeakKeyDictionary()  # type: Dict[type, bool]
+_type_done_callbacks = WeakKeyDictionary()
 
 
 def is_future_like(_type):
Remove incorrect type annotation

mypy complained that WeakKeyDictionary is not a Dict[type, bool].