diff --git a/awx/main/migrations/0139_isolated_removal.py b/awx/main/migrations/0139_isolated_removal.py
index 024fd23ccb..0db16b6348 100644
--- a/awx/main/migrations/0139_isolated_removal.py
+++ b/awx/main/migrations/0139_isolated_removal.py
@@ -11,11 +11,8 @@ def remove_iso_instances(apps, schema_editor):
 
 def remove_iso_groups(apps, schema_editor):
     InstanceGroup = apps.get_model('main', 'InstanceGroup')
-    UnifiedJob = apps.get_model('main', 'UnifiedJob')
     with transaction.atomic():
-        for ig in InstanceGroup.objects.filter(controller__isnull=False):
-            UnifiedJob.objects.filter(instance_group=ig).update(instance_group=None)
-            ig.delete()
+        InstanceGroup.objects.filter(controller__isnull=False).delete()
 
 
 class Migration(migrations.Migration):