diff --git a/beesdoo_shift/models/cooperative_status.py b/beesdoo_shift/models/cooperative_status.py
index e5a34cd55..924eb8687 100644
--- a/beesdoo_shift/models/cooperative_status.py
+++ b/beesdoo_shift/models/cooperative_status.py
@@ -453,8 +453,7 @@ def _compute_next_shift(self):
         next_shift_by_worker = {}
         for shift in next_shifts:
             #  take fist shift for each worker
-            if shift.worker_id.id not in next_shift_by_worker:
-                next_shift_by_worker[shift.worker_id.id] = shift
+            next_shift_by_worker.setdefault(shift.worker_id.id, shift)
 
         for rec in self:
             rec.next_shift_id = next_shift_by_worker.get(rec.cooperator_id.id)