diff --git a/attendance_iot/models/attendance_iot.py b/attendance_iot/models/attendance_iot.py
index 07a443e73..43e352b32 100644
--- a/attendance_iot/models/attendance_iot.py
+++ b/attendance_iot/models/attendance_iot.py
@@ -59,7 +59,7 @@ class AttendanceIot(models.Model):
             'res_model': 'attendance.iot.user',
             'view_mode': 'tree',
             'domain': [('attendance_iot_id', '=', self.id)],
-            'context': "{'default_attendance_iot_id': self.id}"
+            'context': {'default_attendance_iot_id': self.id}
         }
 
     def compute_iot_num(self):