diff --git a/quiche/quic/tools/connect_udp_tunnel.cc b/quiche/quic/tools/connect_udp_tunnel.cc
index a0aae85..a72576d 100644
--- a/quiche/quic/tools/connect_udp_tunnel.cc
+++ b/quiche/quic/tools/connect_udp_tunnel.cc
@@ -385,10 +385,8 @@
 
   structured_headers::Item proxy_status_item(structured_headers::Item::string,
                                              server_label_);
-  // TODO(apaseltiner): RFC 9209, Section 2.1.1 specifies that `error` should be
-  // a token, not a string.
   structured_headers::Item proxy_status_error_item(
-      structured_headers::Item::string, proxy_status_error);
+      structured_headers::Item::token, proxy_status_error);
   structured_headers::Item proxy_status_details_item(
       structured_headers::Item::string, error_details);
   structured_headers::ParameterizedMember proxy_status_member(