diff --git a/pkg/api/alertmanager.go b/pkg/api/alertmanager.go
index d1ba84c79c0..e0e0f234558 100644
--- a/pkg/api/alertmanager.go
+++ b/pkg/api/alertmanager.go
@@ -75,7 +75,7 @@ import (
 // delete silence
 //
 //     Responses:
-//       200: Ok
+//       200: Ack
 //       400: ValidationError
 
 // swagger:parameters RouteCreateSilence
diff --git a/spec.json b/spec.json
index d07f5f8da22..3a2e4b2da29 100644
--- a/spec.json
+++ b/spec.json
@@ -506,7 +506,10 @@
         ],
         "responses": {
           "200": {
-            "$ref": "#/responses/Ok"
+            "description": "Ack",
+            "schema": {
+              "$ref": "#/definitions/Ack"
+            }
           },
           "400": {
             "description": "ValidationError",