diff --git a/proxy/proxy.go b/proxy/proxy.go
index b0103e2..b2d62c6 100644
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -138,7 +138,7 @@ func (p *Proxy) handle(w http.ResponseWriter, r *http.Request) error {
 		return fmt.Errorf("error forwarding request: %s", err)
 	}
 	defer resp.Body.Close()
-	user_agent = r.Header().Get("User-Agent")
+	user_agent := r.Header.Get("User-Agent")
 	w.Header().Set("User-Agent", user_agent)
 	rw := newResponseWriter(w)
 	rr := newResponseReader(resp)