diff --git a/api/onnx_web/worker/pool.py b/api/onnx_web/worker/pool.py
index 44ecc824..c79a981f 100644
--- a/api/onnx_web/worker/pool.py
+++ b/api/onnx_web/worker/pool.py
@@ -1,5 +1,4 @@
 from collections import Counter
-from functools import partial
 from logging import getLogger
 from queue import Empty
 from threading import Thread
@@ -107,7 +106,7 @@ class DevicePoolExecutor:
         self.context[name] = context
         worker = Process(
             name=f"onnx-web worker: {name}",
-            target=partial(worker_main, self),
+            target=worker_main,
             args=(context, self.server),
         )
 
@@ -118,7 +117,13 @@ class DevicePoolExecutor:
 
     def create_logger_worker(self) -> None:
         logger_thread = Thread(
-            name="onnx-web logger", target=logger_main, args=(self.logs,), daemon=True
+            name="onnx-web logger",
+            target=logger_main,
+            args=(
+                self,
+                self.logs,
+            ),
+            daemon=True,
         )
         self.threads["logger"] = logger_thread
 
@@ -128,8 +133,11 @@ class DevicePoolExecutor:
     def create_progress_worker(self) -> None:
         progress_thread = Thread(
             name="onnx-web progress",
-            target=partial(progress_main, self),
-            args=(self.progress,),
+            target=progress_main,
+            args=(
+                self,
+                self.progress,
+            ),
             daemon=True,
         )
         self.threads["progress"] = progress_thread
@@ -417,6 +425,7 @@ class DevicePoolExecutor:
                 )
                 self.context[progress.device].set_cancel()
 
+
 def logger_main(pool: DevicePoolExecutor, logs: Queue):
     logger.trace("checking in from logger worker thread")
 
@@ -433,6 +442,7 @@ def logger_main(pool: DevicePoolExecutor, logs: Queue):
         except Exception:
             logger.exception("error in log worker")
 
+
 def progress_main(pool: DevicePoolExecutor, queue: "Queue[ProgressCommand]"):
     logger.trace("checking in from progress worker thread")
     while True: