diff --git a/machines/migrations/0103_auto_20191002_2222.py b/machines/migrations/0103_auto_20191002_2222.py
index ef0bc830..43adac74 100644
--- a/machines/migrations/0103_auto_20191002_2222.py
+++ b/machines/migrations/0103_auto_20191002_2222.py
@@ -10,14 +10,14 @@ class Migration(migrations.Migration):
 
     dependencies = [
         ('machines', '0102_auto_20190303_1611'),
-        ('preferences', '0064_optionalmachine_default_dns_ttl'),
+        ('preferences', '0066_optionalmachine_default_dns_ttl'),
     ]
 
     operations = [
         migrations.AddField(
             model_name='domain',
             name='ttl',
-            field=models.PositiveIntegerField(default=machines.models.get_default_ttl, verbose_name='Time To Live (TTL)'),
+            field=models.PositiveIntegerField(default=0, verbose_name='Time To Live (TTL)'),
         ),
         migrations.AddField(
             model_name='mx',
diff --git a/machines/models.py b/machines/models.py
index 708dd8c9..ca881033 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -1560,10 +1560,6 @@ class Ipv6List(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
         return str(self.ipv6)
 
 
-def get_default_ttl():
-    return preferences.models.OptionalMachine.get_cached_value('default_dns_ttl')
-
-
 class Domain(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
     """ Objet domain. Enregistrement A et CNAME en même temps : permet de
     stocker les alias et les nom de machines, suivant si interface_parent
@@ -1588,7 +1584,8 @@ class Domain(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
     )
     ttl = models.PositiveIntegerField(
         verbose_name=_("Time To Live (TTL)"),
-        default=get_default_ttl
+        default=0 # 0 means that the re2o-service for DNS should retrieve the
+        # default TTL
     )
 
     class Meta:
diff --git a/preferences/migrations/0064_optionalmachine_default_dns_ttl.py b/preferences/migrations/0066_optionalmachine_default_dns_ttl.py
similarity index 90%
rename from preferences/migrations/0064_optionalmachine_default_dns_ttl.py
rename to preferences/migrations/0066_optionalmachine_default_dns_ttl.py
index f87cafca..47e3519e 100644
--- a/preferences/migrations/0064_optionalmachine_default_dns_ttl.py
+++ b/preferences/migrations/0066_optionalmachine_default_dns_ttl.py
@@ -8,7 +8,7 @@ from django.db import migrations, models
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('preferences', '0063_mandate'),
+        ('preferences', '0065_auto_20191010_1227'),
     ]
 
     operations = [