diff --git a/trove/common/apischema.py b/trove/common/apischema.py
index fdf01f2def..f9cca8636d 100644
--- a/trove/common/apischema.py
+++ b/trove/common/apischema.py
@@ -197,9 +197,14 @@ users_list = {
     }
 }
 
+null_configuration_id = {
+    "type": "null"
+}
+
 configuration_id = {
     'oneOf': [
-        uuid
+        uuid,
+        null_configuration_id
     ]
 }
 
@@ -301,10 +306,12 @@ instance = {
             "instance": {
                 "type": "object",
                 "required": [],
+                "additionalProperties": False,
                 "properties": {
                     "slave_of": {},
+                    "replica_of": {},
                     "name": non_empty_string,
-                    "configuration_id": configuration_id,
+                    "configuration": configuration_id,
                 }
             }
         }
diff --git a/trove/instance/service.py b/trove/instance/service.py
index 911df79b6d..bb1129c2ae 100644
--- a/trove/instance/service.py
+++ b/trove/instance/service.py
@@ -304,7 +304,9 @@ class InstanceController(wsgi.Controller):
         instance = models.Instance.load(context, id)
 
         args = {}
-        args['detach_replica'] = 'slave_of' in body['instance']
+        args['detach_replica'] = ('replica_of' in body['instance'] or
+                                  'slave_of' in body['instance'])
+
         if 'name' in body['instance']:
             args['name'] = body['instance']['name']
         if 'configuration' in body['instance']: