diff --git a/proxy/core/acceptor/acceptor.py b/proxy/core/acceptor/acceptor.py
index 648f51edc5..eeb2955269 100644
--- a/proxy/core/acceptor/acceptor.py
+++ b/proxy/core/acceptor/acceptor.py
@@ -10,6 +10,7 @@
 """
 import logging
 import multiprocessing
+import multiprocessing.synchronize
 import selectors
 import socket
 import threading
@@ -33,20 +34,20 @@ class Acceptor(multiprocessing.Process):
     starts a new work thread.
     """
 
-    lock = multiprocessing.Lock()
-
     def __init__(
             self,
             idd: int,
             work_queue: connection.Connection,
             flags: Flags,
             work_klass: Type[ThreadlessWork],
+            lock: multiprocessing.synchronize.Lock,
             event_queue: Optional[EventQueue] = None) -> None:
         super().__init__()
         self.idd = idd
         self.work_queue: connection.Connection = work_queue
         self.flags = flags
         self.work_klass = work_klass
+        self.lock = lock
         self.event_queue = event_queue
 
         self.running = multiprocessing.Event()
@@ -101,12 +102,13 @@ def start_work(self, conn: socket.socket, addr: Tuple[str, int]) -> None:
             work_thread.start()
 
     def run_once(self) -> None:
-        assert self.selector and self.sock
         with self.lock:
+            assert self.selector and self.sock
             events = self.selector.select(timeout=1)
             if len(events) == 0:
                 return
             conn, addr = self.sock.accept()
+
         # now = time.time()
         # fileno: int = conn.fileno()
         self.start_work(conn, addr)
diff --git a/proxy/core/acceptor/pool.py b/proxy/core/acceptor/pool.py
index 4b83b9ae95..87d7158f26 100644
--- a/proxy/core/acceptor/pool.py
+++ b/proxy/core/acceptor/pool.py
@@ -24,6 +24,8 @@
 
 logger = logging.getLogger(__name__)
 
+LOCK = multiprocessing.Lock()
+
 
 class AcceptorPool:
     """AcceptorPool.
@@ -66,7 +68,8 @@ def start_workers(self) -> None:
                 work_queue=work_queue[1],
                 flags=self.flags,
                 work_klass=self.work_klass,
-                event_queue=self.event_queue
+                lock=LOCK,
+                event_queue=self.event_queue,
             )
             acceptor.start()
             logger.debug(
diff --git a/tests/core/test_acceptor.py b/tests/core/test_acceptor.py
index 537339d537..2b4dbd9bc3 100644
--- a/tests/core/test_acceptor.py
+++ b/tests/core/test_acceptor.py
@@ -29,6 +29,7 @@ def setUp(self) -> None:
             idd=self.acceptor_id,
             work_queue=self.pipe[1],
             flags=self.flags,
+            lock=multiprocessing.Lock(),
             work_klass=self.mock_protocol_handler)
 
     @mock.patch('selectors.DefaultSelector')