diff --git a/smash/web/models.py b/smash/web/models.py
index a1d1776ef76c0719c12a6ad5da634e1e8932bc6d..c733dfa173e4544bd6dc49221db8accee8841ed0 100644
--- a/smash/web/models.py
+++ b/smash/web/models.py
@@ -220,7 +220,8 @@ class Room (models.Model):
 
 class AppointmentType (models.Model):
     required_equipment = models.ManyToManyField(Item,
-        verbose_name='Required equipment'
+        verbose_name='Required equipment',
+        blank = True
     )
     code = models.CharField(max_length=20,
         verbose_name='Appointment code'