diff --git a/pytools/__init__.py b/pytools/__init__.py
index 513207ea8a0df1887dcef9e1fe1eacef11a2b168..a2c167c4d0b5b4c2a34e58a2cb4efce68476bfbd 100644
--- a/pytools/__init__.py
+++ b/pytools/__init__.py
@@ -414,7 +414,10 @@ class RecordWithoutPickling:
     __slots__: ClassVar[List[str]] = []
     fields: ClassVar[Set[str]]
 
-    def __init__(self, valuedict=None, exclude=None, **kwargs):
+    def __init__(self,
+                 valuedict: Optional[Mapping[str, Any]] = None,
+                 exclude: Optional[Sequence[str]] = None,
+                 **kwargs: Any) -> None:
         assert self.__class__ is not Record
 
         if exclude is None: