diff --git a/src/build123d/build_common.py b/src/build123d/build_common.py
index e5e1000..db921bf 100644
--- a/src/build123d/build_common.py
+++ b/src/build123d/build_common.py
@@ -1283,7 +1283,7 @@ class WorkplaneList:
 
 
 P = ParamSpec("P")
-T2 = TypeSpec("T2")
+T2 = TypeVar("T2")
 
 
 def __gen_context_component_getter(