diff --git a/include/cinatra/websocket.hpp b/include/cinatra/websocket.hpp
index 82178960..2fc94a72 100644
--- a/include/cinatra/websocket.hpp
+++ b/include/cinatra/websocket.hpp
@@ -260,7 +260,7 @@ class websocket {
   unsigned char msg_opcode_ = 0;
   unsigned char msg_fin_ = 0;
 
-  char msg_header_[10];
+  char msg_header_[14];
   ws_head_len len_bytes_ = SHORT_HEADER;
 };