diff --git a/include/cinatra/coro_http_client.hpp b/include/cinatra/coro_http_client.hpp
index 0f48ed56..4dfca64a 100644
--- a/include/cinatra/coro_http_client.hpp
+++ b/include/cinatra/coro_http_client.hpp
@@ -1867,6 +1867,7 @@ class coro_http_client : public std::enable_shared_from_this<coro_http_client> {
   bool enable_tcp_no_delay_ = false;
   std::string resp_chunk_str_;
   std::span<char> out_buf_;
+  static constexpr uint64_t websocket_split_part_size_ = 3145728;
 
 #ifdef BENCHMARK_TEST
   std::string req_str_;