diff --git a/attachment_image_resize/models/ir_attachment.py b/attachment_image_resize/models/ir_attachment.py
index a1ca4e3..5bc0a02 100644
--- a/attachment_image_resize/models/ir_attachment.py
+++ b/attachment_image_resize/models/ir_attachment.py
@@ -19,7 +19,7 @@ def _postprocess_contents(self, values):
         self = self.with_context(
             resize_target_model=values.get("res_model") or self.res_model
         )
-        self.resize_done = True
+        values["resize_done"] = True
         return super()._postprocess_contents(values)
 
     @api.model