diff --git a/frontend/main.go b/frontend/main.go
index 3d76545..f6d207f 100644
--- a/frontend/main.go
+++ b/frontend/main.go
@@ -66,6 +66,7 @@ func main() {
 	mux := http.NewServeMux()
 	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
 	mux.HandleFunc("GET /{$}", app.Home)
+	mux.HandleFunc("GET /index.php", app.Home) // legacy old-site URL form (?x=5&productid=…)
 	mux.HandleFunc("GET /about", app.About)
 	mux.HandleFunc("GET /what-is-this", app.WhatIsThis)
 	mux.HandleFunc("GET /contact", app.Contact)