diff --git a/src/scaler/scheduler/controllers/mixins.py b/src/scaler/scheduler/controllers/mixins.py
index b95ac1a29..a7fbf465f 100644
--- a/src/scaler/scheduler/controllers/mixins.py
+++ b/src/scaler/scheduler/controllers/mixins.py
@@ -156,7 +156,7 @@ def acquire_worker(self, task: Task) -> Optional[WorkerID]:
         raise NotImplementedError()
 
     @abc.abstractmethod
-    async def on_task_cancel(self, task_cancel: TaskCancel) -> bytes:
+    async def on_task_cancel(self, task_cancel: TaskCancel) -> WorkerID:
         raise NotImplementedError()
 
     @abc.abstractmethod
diff --git a/src/scaler/scheduler/controllers/task_controller.py b/src/scaler/scheduler/controllers/task_controller.py
index 2245fbdb2..830c8913f 100644
--- a/src/scaler/scheduler/controllers/task_controller.py
+++ b/src/scaler/scheduler/controllers/task_controller.py
@@ -289,7 +289,8 @@ async def __state_failed_worker_died(
 
     async def __send_task_cancel_to_worker(self, task_cancel: TaskCancel):
         worker = await self._worker_controller.on_task_cancel(task_cancel)
-        if not worker:
+        assert isinstance(worker, WorkerID)
+        if not worker.is_valid():
             logging.error(f"{task_cancel.task_id!r}: cannot find task in worker to cancel")
             await self.__routing(
                 task_cancel.task_id,
@@ -300,7 +301,7 @@ async def __send_task_cancel_to_worker(self, task_cancel: TaskCancel):
             )
             return
 
-        await self._binder.send(worker, TaskCancel.new_msg(task_cancel.task_id))
+        await self._binder.send(worker, task_cancel)
         await self.__send_monitor(task_cancel.task_id, b"")
 
     async def __send_task_result_to_client(self, task_result: TaskResult):
diff --git a/src/scaler/scheduler/controllers/worker_controller.py b/src/scaler/scheduler/controllers/worker_controller.py
index 33d1d3cf7..3fbb67f63 100644
--- a/src/scaler/scheduler/controllers/worker_controller.py
+++ b/src/scaler/scheduler/controllers/worker_controller.py
@@ -43,13 +43,12 @@ def register(self, binder: AsyncBinder, binder_monitor: AsyncConnector, task_con
     def acquire_worker(self, task: Task) -> WorkerID:
         return self._scaler_policy.assign_task(task)
 
-    async def on_task_cancel(self, task_cancel: TaskCancel):
+    async def on_task_cancel(self, task_cancel: TaskCancel) -> WorkerID:
         worker = self._scaler_policy.remove_task(task_cancel.task_id)
         if not worker.is_valid():
             logging.error(f"cannot find task_id={task_cancel.task_id.hex()} in task workers")
-            return
 
-        await self._binder.send(worker, task_cancel)
+        return worker
 
     async def on_task_done(self, task_id: TaskID) -> WorkerID:
         worker = self._scaler_policy.remove_task(task_id)
diff --git a/src/scaler/version.txt b/src/scaler/version.txt
index 092afa15d..511a76e6f 100644
--- a/src/scaler/version.txt
+++ b/src/scaler/version.txt
@@ -1 +1 @@
-1.17.0
+1.17.1