diff --git a/polynum/base/models/entity.py b/polynum/base/models/entity.py
index 87a7e76..5c09c33 100644
--- a/polynum/base/models/entity.py
+++ b/polynum/base/models/entity.py
@@ -57,7 +57,7 @@ class Entity(models.Model):
     depth = models.PositiveIntegerField(verbose_name=_('Niveau'), default=0, db_index=True)
     left_bound = models.PositiveIntegerField(unique=True, db_index=True)
     right_bound = models.PositiveIntegerField(unique=True, db_index=True)
-    parent = models.ForeignKey('Entity', verbose_name=_(u'Entité parente'), blank=True, null=True, related_name='children_set', on_delete=models.PROTECT)
+    parent = models.ForeignKey('Entity', verbose_name=_(u'Entité parente'), blank=True, null=True, related_name='children_set')
 
     def children(self, included=False):
         if included:
diff --git a/polynum/base/models/rbac.py b/polynum/base/models/rbac.py
index 7a097ea..5563d25 100644
--- a/polynum/base/models/rbac.py
+++ b/polynum/base/models/rbac.py
@@ -35,5 +35,5 @@ class RoleAssociation(models.Model):
         return u'%s,%s -> %s' % (self.user, self.entity, self.role)
 
     user = models.ForeignKey(user.User, verbose_name=_(u'Utilisateur'))
-    entity = models.ForeignKey('Entity', verbose_name=_(u'Entité administrative'), on_delete=models.PROTECT)
-    role = models.ForeignKey('Role', verbose_name=_(u'Rôle'), on_delete=models.PROTECT)
+    entity = models.ForeignKey('Entity', verbose_name=_(u'Entité administrative'))
+    role = models.ForeignKey('Role', verbose_name=_(u'Rôle'))