diff --git a/netbox_dns/migrations/0019_update_ns_ttl.py b/netbox_dns/migrations/0019_update_ns_ttl.py
new file mode 100644
index 0000000..2c3656a
--- /dev/null
+++ b/netbox_dns/migrations/0019_update_ns_ttl.py
@@ -0,0 +1,20 @@
+from django.db import migrations
+
+
+def update_ns_ttl(apps, schema_editor):
+    Zone = apps.get_model("netbox_dns", "Zone")
+
+    for zone in Zone.objects.all():
+        for nameserver in zone.nameservers.all():
+            nameserver.ttl = None
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("netbox_dns", "0018_zone_arpa_network"),
+    ]
+
+    operations = [
+        migrations.RunPython(update_ns_ttl),
+    ]
diff --git a/netbox_dns/models.py b/netbox_dns/models.py
index 59746ae..f511ead 100644
--- a/netbox_dns/models.py
+++ b/netbox_dns/models.py
@@ -273,7 +273,6 @@ def update_soa_record(self):
 
     def update_ns_records(self, nameservers):
         ns_name = "@"
-        ns_ttl = self.default_ttl
 
         delete_ns = self.record_set.filter(
             type=RecordTypeChoices.NS, managed=True
@@ -286,7 +285,6 @@ def update_ns_records(self, nameservers):
                 zone_id=self.pk,
                 type=RecordTypeChoices.NS,
                 name=ns_name,
-                ttl=ns_ttl,
                 value=ns,
                 managed=True,
             )