diff --git a/backend/app/api/tasks.py b/backend/app/api/tasks.py
index 29a810b0..79c2d1f3 100644
--- a/backend/app/api/tasks.py
+++ b/backend/app/api/tasks.py
@@ -2206,6 +2206,7 @@ async def _apply_admin_task_rules(
             update.task.in_progress_at = None
         elif status_value == "review":
             update.task.previous_in_progress_at = update.task.in_progress_at
+            update.task.assigned_agent_id = None
             update.task.in_progress_at = None
         elif status_value == "in_progress":
             update.task.in_progress_at = utcnow()
diff --git a/backend/tests/test_task_agent_permissions.py b/backend/tests/test_task_agent_permissions.py
index e4d0f377..e318999a 100644
--- a/backend/tests/test_task_agent_permissions.py
+++ b/backend/tests/test_task_agent_permissions.py
@@ -400,8 +400,8 @@ async def test_non_lead_agent_moves_task_to_review_and_task_unassigns() -> None:
             assert updated.in_progress_at is None
 
             refreshed_task = (
-                (await session.exec(select(Task).where(col(Task.id) == task_id))).first()
-            )
+                await session.exec(select(Task).where(col(Task.id) == task_id))
+            ).first()
             assert refreshed_task is not None
             assert refreshed_task.previous_in_progress_at == in_progress_at
     finally: