diff --git a/src/aarecommon/models/models.py b/src/aarecommon/models/models.py
index 890373a..256cd85 100644
--- a/src/aarecommon/models/models.py
+++ b/src/aarecommon/models/models.py
@@ -565,8 +565,8 @@ def def_loop_centering_zoom(beamline) -> ZoomModel:
 
 
 def zoom_manager(
-    mode: ZoomModeEnum = ZoomModeEnum.User, beamline: MXBeamline = None
-) -> ZoomModel | None:
+    mode: ZoomModeEnum = ZoomModeEnum.User, beamline: MXBeamline | None = None
+) -> ZoomModel:
     if beamline is None or beamline == MXBeamline.SIMULATED:
         print("SIMULATED")
         return def_zoom(beamline)