From d6c58fe43cb40de2669d961521eeb9162df4d857 Mon Sep 17 00:00:00 2001
From: AlberLC <alberlc@outlook.com>
Date: Mon, 2 Mar 2026 11:35:26 +0100
Subject: [PATCH] fix: response_classes type consistency

---
 fastapi/openapi/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 7efbe796eb..dbf0cf595c 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -345,7 +345,7 @@ def get_openapi_path(
                         *route.return_response_classes,
                     )
                 else:
-                    response_classes = route.return_response_classes
+                    response_classes = tuple(route.return_response_classes)
             else:
                 response_classes = (current_response_class,)