diff --git a/queue_job/controllers/main.py b/queue_job/controllers/main.py
index adc450d52..51f91794b 100644
--- a/queue_job/controllers/main.py
+++ b/queue_job/controllers/main.py
@@ -7,6 +7,7 @@
 import time
 import traceback
 from io import StringIO
+from typing import Optional
 
 from psycopg2 import OperationalError, errorcodes
 from werkzeug.exceptions import BadRequest, Forbidden
@@ -27,7 +28,7 @@
 
 class RunJobController(http.Controller):
     @classmethod
-    def _acquire_job(cls, env: api.Environment, job_uuid: str) -> Job | None:
+    def _acquire_job(cls, env: api.Environment, job_uuid: str) -> Optional[Job]:
         """Acquire a job for execution.
 
         - make sure it is in ENQUEUED state