diff --git a/src/h2load_quic.cc b/src/h2load_quic.cc
index e6f019c4..445a005e 100644
--- a/src/h2load_quic.cc
+++ b/src/h2load_quic.cc
@@ -159,7 +159,8 @@ int stream_close(ngtcp2_conn *conn, int64_t stream_id, uint64_t app_error_code,
 
 int Client::quic_stream_close(int64_t stream_id, uint64_t app_error_code) {
   auto s = static_cast<Http3Session *>(session.get());
-  if (s->close_stream(stream_id, app_error_code) != 0) {
+  if (s->close_stream(stream_id, app_error_code == 0 ? NGHTTP3_HTTP_NO_ERROR
+                                                     : app_error_code) != 0) {
     return -1;
   }
   return 0;