diff --git a/clearpath_config/platform/types/attachment.py b/clearpath_config/platform/types/attachment.py
index 268b592..47a88ee 100644
--- a/clearpath_config/platform/types/attachment.py
+++ b/clearpath_config/platform/types/attachment.py
@@ -93,5 +93,5 @@ def is_valid(cls, _type: str) -> bool:
         return _type in cls.TYPES
 
     def __new__(cls, _type: str) -> BaseAttachment:
-        assert cls.is_valid(type), f'{cls.PLATFORM} does not have attachment "{_type}". Must be one of "{cls.TYPES}"'  # noqa:E501
+        assert cls.is_valid(_type), f'{cls.PLATFORM} does not have attachment "{_type}". Must be one of "{cls.TYPES}"'  # noqa:E501
         return cls.TYPES[_type]