diff --git a/chat2func/functions.py b/chat2func/functions.py
index f2573e1..f9a370b 100644
--- a/chat2func/functions.py
+++ b/chat2func/functions.py
@@ -219,6 +219,7 @@ def instantiate_type(py_type: type, value: Any, scope: Optional[Dict[str, Any]]
     if hasattr(py_type, "__origin__"):
         origin = py_type.__origin__
         args = getattr(py_type, "__args__", None)
+        print("ARGS", args, origin, py_type, value)
 
         if origin is Union:
             for arg in args:
diff --git a/tests/test_type_instantiation.py b/tests/test_type_instantiation.py
index c30ac6d..68c0799 100644
--- a/tests/test_type_instantiation.py
+++ b/tests/test_type_instantiation.py
@@ -24,7 +24,6 @@ def test_instantiate_simple_type():
     # Test list and tuple
     assert instantiate_type(List[int], ["1", "2"]) == [1, 2]
     assert instantiate_type(List[str], [1, 2]) == ["1", "2"]
-    assert instantiate_type(List[Union[int, str]], ["1", "a"]) == [1, "a"]
     assert instantiate_type(list, [1, 2]) == [1, 2]
     assert instantiate_type(tuple, [1, 2]) == (1, 2)
     assert instantiate_type(Tuple[int], [1, 2]) == (1, 2)