diff --git a/nonstop/migrations/0004_auto_20170418_1525.py b/nonstop/migrations/0004_auto_20170418_1525.py
new file mode 100644
index 0000000000000000000000000000000000000000..e639e743cb43110b999097675d8f6d5eaf6b9f01
--- /dev/null
+++ b/nonstop/migrations/0004_auto_20170418_1525.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('nonstop', '0003_track_nonstop_zones'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='track',
+            name='nonstop_zones',
+            field=models.ManyToManyField(to='emissions.Nonstop', blank=True),
+        ),
+    ]
diff --git a/nonstop/models.py b/nonstop/models.py
index 92c37d3743ea58f117ee5c018887b35858382da4..e704786fdc38be5cce85982c806f6b2dc82147d1 100644
--- a/nonstop/models.py
+++ b/nonstop/models.py
@@ -38,7 +38,7 @@ class Track(models.Model):
             choices=LANGUAGES, blank=True)
     sabam = models.BooleanField('SABAM', default=True)
     cfwb = models.BooleanField('CFWB', default=False)
-    nonstop_zones = models.ManyToManyField('emissions.Nonstop', null=True, blank=True)
+    nonstop_zones = models.ManyToManyField('emissions.Nonstop', blank=True)
 
     def get_absolute_url(self):
         return reverse('track-view', kwargs={'pk': self.id})