diff --git a/booking.py b/booking.py
index 411ab05..3aa6875 100644
--- a/booking.py
+++ b/booking.py
@@ -781,8 +781,10 @@ class Booking(Workflow, ModelSQL, ModelView):
     def check_rooms(self):
         Housekeeping = Pool().get('hotel.housekeeping')
         rooms_ids = []
-        for line in self.lines:
-            rooms_ids.append(line.room.id)
+        for folio in self.lines:
+            if folio.registration_state == 'check_out':
+                continue
+            rooms_ids.append(folio.room.id)
         housekeepings = Housekeeping.search([
             ('state', '!=', 'clean')
         ])