diff --git a/include/msgpack/v1/object.hpp b/include/msgpack/v1/object.hpp
index 64da8c53..9721f705 100644
--- a/include/msgpack/v1/object.hpp
+++ b/include/msgpack/v1/object.hpp
@@ -661,7 +661,7 @@ inline object::object(const msgpack_object& o)
 inline void operator<< (msgpack::object& o, const msgpack_object& v)
 {
     // FIXME beter way?
-    std::memcpy(&o, &v, sizeof(v));
+    std::memcpy(static_cast<void*>(&o), &v, sizeof(v));
 }
 
 inline object::operator msgpack_object() const