diff --git a/msgpack/include/msgpack/msgpack.hpp b/msgpack/include/msgpack/msgpack.hpp
index a300d5d..0590b09 100644
--- a/msgpack/include/msgpack/msgpack.hpp
+++ b/msgpack/include/msgpack/msgpack.hpp
@@ -13,6 +13,8 @@
 #include <chrono>
 #include <cmath>
 #include <bitset>
+#include <system_error>
+#include <unordered_map>
 
 namespace msgpack {
 enum class UnpackerError {