diff --git a/tests/docker/asgi_framework_compat/frameworks/quart_app/app.py b/tests/docker/asgi_framework_compat/frameworks/quart_app/app.py
index d429a32e..0a3c3353 100644
--- a/tests/docker/asgi_framework_compat/frameworks/quart_app/app.py
+++ b/tests/docker/asgi_framework_compat/frameworks/quart_app/app.py
@@ -95,7 +95,8 @@ async def echo():
 @app.route("/headers")
 async def headers_endpoint():
     """Return request headers as JSON."""
-    headers_dict = dict(request.headers)
+    # Normalize header keys to lowercase for consistency
+    headers_dict = {k.lower(): v for k, v in request.headers.items()}
     return headers_dict