diff --git a/src/api/blackboard_routes.py b/src/api/blackboard_routes.py
index 469f14b..0224079 100644
--- a/src/api/blackboard_routes.py
+++ b/src/api/blackboard_routes.py
@@ -32,9 +32,9 @@ def _q(project_id: str) -> Queries:
 async def list_tasks(project_id: str,
                      status: Optional[str] = None,
                      assignee: Optional[str] = None,
-                     card_id: Optional[str] = None):
+                     parent_task: Optional[str] = None):
     bb = _bb(project_id)
-    tasks = bb.list_tasks(status=status, assignee=assignee, card_id=card_id)
+    tasks = bb.list_tasks(status=status, assignee=assignee, parent_task=parent_task)
     return {"tasks": [_task_to_dict(t) for t in tasks]}