diff --git a/app.py b/app.py
index 71d7015..56615f8 100644
--- a/app.py
+++ b/app.py
@@ -85,7 +85,7 @@ def ip_lookup():
     d = jf(b) or {}
     hdrs = {k: v for k, v in request.headers.items() if k.lower() in
             ("user-agent","accept-language","x-forwarded-for","cf-connecting-ip","cf-ipcountry","x-real-ip")}
-    proxy_hint = any(k.lower().startswith(("x-forwarded","via","proxy")) for k in request.headers)
+    proxy_hint = any(k.lower().startswith(("x-forwarded","via","proxy")) for k in request.headers.keys())
     rows = [
         ("YOUR IP", f"<b style='font-size:1.3rem;color:var(--acc)'>{d.get('query', ip)}</b>"),
         ("Country", f"{d.get('country','?')} ({d.get('countryCode','?')}) 🏴 {d.get('flag') if 'flag' in d else ''}".strip()),