diff --git a/src/crate/client/converter.py b/src/crate/client/converter.py
index 37c70ae3..c4080b52 100644
--- a/src/crate/client/converter.py
+++ b/src/crate/client/converter.py
@@ -29,8 +29,7 @@
 from enum import Enum
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
-InputVal = Any
-ConverterFunction = Callable[[Optional[InputVal]], Optional[Any]]
+ConverterFunction = Callable[[Optional[Any]], Optional[Any]]
 ConverterDefinition = Union[ConverterFunction, Tuple[ConverterFunction, "ConverterDefinition"]]
 ColTypesDefinition = Union[int, List[Union[int, "ColTypesDefinition"]]]
 
@@ -53,7 +52,7 @@ def _to_datetime(value: Optional[float]) -> Optional[datetime]:
     return datetime.utcfromtimestamp(value / 1e3)
 
 
-def _to_default(value: Optional[InputVal]) -> Optional[Any]:
+def _to_default(value: Optional[Any]) -> Optional[Any]:
     return value