diff --git a/include/msgpack/v1/cpp_config_decl.hpp b/include/msgpack/v1/cpp_config_decl.hpp
index 383a4451..9baf5267 100644
--- a/include/msgpack/v1/cpp_config_decl.hpp
+++ b/include/msgpack/v1/cpp_config_decl.hpp
@@ -87,6 +87,7 @@ struct is_pointer;
 
 #include <memory>
 #include <tuple>
+#include <type_traits>
 
 namespace msgpack {
 /// @cond