diff --git a/src/ess/reduce/data/_registry.py b/src/ess/reduce/data/_registry.py
index 94857e98..6c1d7a44 100644
--- a/src/ess/reduce/data/_registry.py
+++ b/src/ess/reduce/data/_registry.py
@@ -134,7 +134,7 @@ def __post_init__(self, unzip: bool) -> None:
         if self.extractor is not None and unzip:
             raise TypeError("Set either the 'unzip' argument or 'extractor', not both.")
         if self.extractor is None and unzip:
-            super().__setattr__("extractor", "unzip")
+            object.__setattr__(self, "extractor", "unzip")
 
     @classmethod
     def from_pooch_string(cls, pooch_string: str) -> Entry: