diff --git a/golem_activity_registration_slot/models/golem_activity_registration_slot.py b/golem_activity_registration_slot/models/golem_activity_registration_slot.py
index 2df895d..183a539 100644
--- a/golem_activity_registration_slot/models/golem_activity_registration_slot.py
+++ b/golem_activity_registration_slot/models/golem_activity_registration_slot.py
@@ -29,5 +29,7 @@ class GolemActivityRegistrationSlot(models.Model):
     activity_id = fields.Many2one('golem.activity', required=True,
                                   string='Activity', ondelete='cascade',
                                   index=True)
+    member_id = fields.Many2one('golem.member', string='Member',
+                                ondelete='cascade', index=True)
     hour_start = fields.Float('Start time')
     hour_stop = fields.Float('Stop time')