diff --git a/karton/core/backend.py b/karton/core/backend.py
index 6117adf..bb06c8c 100644
--- a/karton/core/backend.py
+++ b/karton/core/backend.py
@@ -449,7 +449,7 @@ def get_tasks(
             chunk_size,
         )
         return [
-            Task.unserialize(task_data, parse_resources=parse_resources)
+            Task.unserialize(task_data, backend=self, parse_resources=parse_resources)
             for chunk in keys
             for task_data in self.redis.mget(chunk)
             if task_data is not None
@@ -463,7 +463,9 @@ def _iter_tasks(
     ) -> Iterator[Task]:
         for chunk in chunks_iter(task_keys, chunk_size):
             yield from (
-                Task.unserialize(task_data, parse_resources=parse_resources)
+                Task.unserialize(
+                    task_data, backend=self, parse_resources=parse_resources
+                )
                 for task_data in self.redis.mget(chunk)
                 if task_data is not None
             )