diff --git a/swh/loader/package/nixguix/loader.py b/swh/loader/package/nixguix/loader.py
--- a/swh/loader/package/nixguix/loader.py
+++ b/swh/loader/package/nixguix/loader.py
@@ -64,8 +64,9 @@
         storage: StorageInterface,
         url: str,
         unsupported_file_extensions: List[str] = [],
+        max_content_size: Optional[int] = None,
     ):
-        super().__init__(storage=storage, url=url)
+        super().__init__(storage=storage, url=url, max_content_size=max_content_size)
         self.provider_url = url
         self.unsupported_file_extensions = unsupported_file_extensions