diff --git a/impl/traceable_list.hpp b/impl/traceable_list.hpp
index 053f4bb646bd333f2dce93d1e7a0146db6c6e960..07f7030206529dc7988161e8b340697cfd81ae89 100644
--- a/impl/traceable_list.hpp
+++ b/impl/traceable_list.hpp
@@ -19,7 +19,7 @@ namespace rlib {
                 node *prev;
                 node *next;
                 extra_info_t extra_info; // bool flag. specially designed for object_pool.
-                uint32_t magic = 0x19980427;
+                uint32_t magic = 0x19990823;
                 template <typename... TConstructArgs>
                 node(node *prev, node *next, const extra_info_t &extra_info, TConstructArgs... args) 
                     : data(std::forward<TConstructArgs>(args) ...), prev(prev), next(next), extra_info(extra_info)
@@ -36,7 +36,7 @@ namespace rlib {
                 explicit iterator(node *ptr) : ptr(ptr) {}
 
                 explicit iterator(T *data_pointer) : ptr(reinterpret_cast<node *>(data_pointer)) {
-                    if (ptr->magic != 0x19980427)
+                    if (ptr->magic != 0x19990823)
                         throw std::invalid_argument(
                                 "magic_num verification failed. invalid data_pointer passed or ruined memory?");
                 }
diff --git a/sys/sio.hpp b/sys/sio.hpp
index a89c382ee36bb75cef088ae40a7eef196e2730e4..57902f92a02c13bd8b55e6007c816078ba912504 100644
--- a/sys/sio.hpp
+++ b/sys/sio.hpp
@@ -631,7 +631,7 @@ namespace rlib {
     private:
 #pragma pack(push, 1)
         struct packed_msg_head {
-            uint32_t magic = 0x19980427;
+            uint32_t magic = 0x19990823;
             uint64_t len;
         };
 #pragma pack(pop)
@@ -640,7 +640,7 @@ namespace rlib {
         static std::string recv_msg(sockfd_t fd) {
             packed_msg_head head;
             recvn_ex(fd, &head, sizeof(head), MSG_NOSIGNAL);
-            if(head.magic != 0x19980427)
+            if(head.magic != 0x19990823)
                 throw std::runtime_error("Invalid magic received.");
             if(head.len > 1024ull*1024*1024*2)
                 throw std::runtime_error("Message len is greater than 2GiB. Refuse to alloc space.");