diff --git a/apps/ops/migrations/0010_auto_20191217_1758.py b/apps/ops/migrations/0010_auto_20191217_1758.py
index 7e999a33b..a9a1555c0 100644
--- a/apps/ops/migrations/0010_auto_20191217_1758.py
+++ b/apps/ops/migrations/0010_auto_20191217_1758.py
@@ -18,7 +18,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='adhoc',
             name='_become',
-            field=common.fields.model.EncryptJsonDictCharField(blank=True, default='', max_length=1024, verbose_name='Become'),
+            field=common.fields.model.EncryptJsonDictCharField(blank=True, null=True, default='', max_length=1024, verbose_name='Become'),
         ),
         migrations.AlterField(
             model_name='adhoc',
diff --git a/apps/ops/models/adhoc.py b/apps/ops/models/adhoc.py
index 3e0220b68..73dfd4339 100644
--- a/apps/ops/models/adhoc.py
+++ b/apps/ops/models/adhoc.py
@@ -185,7 +185,7 @@ class AdHoc(models.Model):
     hosts = models.ManyToManyField('assets.Asset', verbose_name=_("Host"))
     run_as_admin = models.BooleanField(default=False, verbose_name=_('Run as admin'))
     run_as = models.CharField(max_length=64, default='', blank=True, null=True, verbose_name=_('Username'))
-    become = EncryptJsonDictCharField(max_length=1024, default='', blank=True, verbose_name=_("Become"))
+    become = EncryptJsonDictCharField(max_length=1024, default='', null=True, blank=True, verbose_name=_("Become"))
     created_by = models.CharField(max_length=64, default='', blank=True, null=True, verbose_name=_('Create by'))
     date_created = models.DateTimeField(auto_now_add=True, db_index=True)