diff --git a/src/cnaas_nms/scheduler/scheduler.py b/src/cnaas_nms/scheduler/scheduler.py
index c59e03af..ac4e5cbe 100644
--- a/src/cnaas_nms/scheduler/scheduler.py
+++ b/src/cnaas_nms/scheduler/scheduler.py
@@ -36,8 +36,8 @@ def __init__(self):
         # If scheduler is already started, use uwsgi ipc to send job to mule process
         self.lock_f = open("/tmp/scheduler.lock", "w")
         try:
-            portalocker.Lock(self.lock_f, flags=portalocker.LOCK_EX | portalocker.LOCK_NB)
-        except BlockingIOError:
+            portalocker.lock(self.lock_f, flags=portalocker.LOCK_EX | portalocker.LOCK_NB)
+        except portalocker.exceptions.LockException:
             try:
                 import uwsgi  # noqa: F401
             except Exception: