diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index 72b33057fe..67cc56f4b2 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -1174,6 +1174,7 @@ class InventoryScriptSerializer(InventorySerializer):
 
 class HostSerializer(BaseSerializerWithVariables):
     show_capabilities = ['edit', 'delete']
+    insights_system_id = serializers.CharField(allow_blank=True, allow_null=True, required=False, default=None)
 
     class Meta:
         model = Host
diff --git a/awx/main/migrations/0038_v320_release.py b/awx/main/migrations/0038_v320_release.py
index ec8c0e4a8e..f0006d3f33 100644
--- a/awx/main/migrations/0038_v320_release.py
+++ b/awx/main/migrations/0038_v320_release.py
@@ -243,8 +243,4 @@ class Migration(migrations.Migration):
             name='insights_system_id',
             field=models.TextField(default=None, help_text='Red Hat Insights host unique identifier.', null=True, db_index=True, blank=True),
         ),
-        migrations.AlterUniqueTogether(
-            name='host',
-            unique_together=set([('insights_system_id', 'inventory'), ('name', 'inventory')]),
-        ),
     ]
diff --git a/awx/main/models/inventory.py b/awx/main/models/inventory.py
index 3326fc44b4..4b4f867a44 100644
--- a/awx/main/models/inventory.py
+++ b/awx/main/models/inventory.py
@@ -353,7 +353,7 @@ class Host(CommonModelNameNotUnique):
 
     class Meta:
         app_label = 'main'
-        unique_together = (("name", "inventory"), ("insights_system_id", "inventory"),) # FIXME: Add ('instance_id', 'inventory') after migration.
+        unique_together = (("name", "inventory"),) # FIXME: Add ('instance_id', 'inventory') after migration.
         ordering = ('name',)
 
     inventory = models.ForeignKey(