diff --git a/src/python/jw/pkg/lib/Types.py b/src/python/jw/pkg/lib/Types.py
index 6b27ea85..bfae01ad 100644
--- a/src/python/jw/pkg/lib/Types.py
+++ b/src/python/jw/pkg/lib/Types.py
@@ -5,7 +5,7 @@ import os
 import re
 import sys
 
-from typing import TYPE_CHECKING, Any, Generic, Iterable, TypeGuard, TypeVar, override
+from typing import TYPE_CHECKING, Any, Generic, Iterable, TypeVar, override
 
 from .log import ERR, OFF, log, parse_log_level
 
@@ -15,9 +15,6 @@ if TYPE_CHECKING:
 
 T = TypeVar('T')
 
-def is_abc_class(c: type[object]) -> TypeGuard[abc.ABCMeta]:
-    return isinstance(c, abc.ABCMeta)
-
 class Types(abc.ABC, Iterable[type[T]], Generic[T]):  # export
 
     @override
@@ -104,9 +101,6 @@ class LoadTypes(Types[T]):  # export
                     if rx is not None and not re.match(rx, member_name):
                         self._debug(f'o "{name}" has wrong name')
                         continue
-                    if not is_abc_class(c):
-                        self._debug(f'o "{name}" is not derived from ABCMeta')
-                        continue
                     if inspect.isabstract(c):
                         self._debug(f'o "{name}" is abstract: {c.__abstractmethods__}')
                         continue