diff --git a/src/app.py b/src/app.py
index 5ff61f4d4f0307d075b0c0f81c29a8fb2ebbc7b3..ad5c9f5715b724721d8b6e954afdf1a18f4776c0 100644
--- a/src/app.py
+++ b/src/app.py
@@ -12,7 +12,7 @@ class ApiFlask(Flask):
     def make_default_options_response(self) -> Response:
         response = super().make_default_options_response()
         # max age is in seconds
-        response.headers["Cache-Control"] = f"max-age={60 * 60}"
+        response.headers["Access-Control-Max-Age"] = f"{60 * 60}"
         return response