diff --git a/plugins/openapi-router/src/types/immutable.ts b/plugins/openapi-router/src/types/immutable.ts
index 880a081ba0..5056512054 100644
--- a/plugins/openapi-router/src/types/immutable.ts
+++ b/plugins/openapi-router/src/types/immutable.ts
@@ -20,6 +20,7 @@ import type {
   RequestBodyObject,
   ParameterObject,
   SchemaObject,
+  ResponseObject,
 } from 'openapi3-ts';
 
 /**
@@ -71,6 +72,11 @@ export type ImmutableContentObject = ImmutableObject<ContentObject>;
  */
 export type ImmutableRequestBodyObject = ImmutableObject<RequestBodyObject>;
 
+/**
+ * @public
+ */
+export type ImmutableResponseObject = ImmutableObject<ResponseObject>;
+
 /**
  * @public
  */
diff --git a/plugins/openapi-router/src/types/responses.ts b/plugins/openapi-router/src/types/responses.ts
index 50a8289dd6..c623b44333 100644
--- a/plugins/openapi-router/src/types/responses.ts
+++ b/plugins/openapi-router/src/types/responses.ts
@@ -18,7 +18,6 @@
  * Pulled from https://github.com/varanauskas/oatx.
  */
 
-import type { ReferenceObject, ResponseObject } from 'openapi3-ts';
 import type {
   ComponentRef,
   ComponentTypes,
@@ -32,6 +31,7 @@ import type {
   ToTypeSafe,
   ValueOf,
 } from './common';
+import { ImmutableReferenceObject, ImmutableResponseObject } from './immutable';
 
 /**
  * @public
@@ -45,7 +45,7 @@ export type Response<
   Doc,
   Path,
   Method
->['responses'][StatusCode] extends ReferenceObject
+>['responses'][StatusCode] extends ImmutableReferenceObject
   ? 'responses' extends ComponentTypes<Doc>
     ? ComponentRef<
         Doc,
@@ -76,7 +76,7 @@ export type Responses<
  */
 export type ResponseSchema<
   Doc extends RequiredDoc,
-  Object extends ResponseObject,
+  Object extends ImmutableResponseObject,
 > = ObjectWithContentSchema<Doc, Object>;
 
 /**
@@ -91,7 +91,7 @@ export type ResponseSchemas<
     Doc,
     DocPath<Doc, Path>,
     Method
-  >[StatusCode] extends ResponseObject
+  >[StatusCode] extends ImmutableResponseObject
     ? ResponseSchema<
         Doc,
         Responses<Doc, DocPath<Doc, Path>, Method>[StatusCode]