diff --git a/src/ifcopenshell-python/ifcopenshell/api/__init__.py b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
index d3d0b2f475..4849d8eeff 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/__init__.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/__init__.py
@@ -342,7 +342,7 @@ def wrap_usecase(usecase_path, usecase):
 
         try:
             result = usecase(*args, **settings)
-        except NotImplementedError as e:
+        except TypeError as e:
             if not e.args[0].startswith(f"{usecase.__name__}()"):
                 # signature errors typically start with function name
                 # e.g. "TypeError: edit_library() got an unexpected keyword argument 'test'"