diff --git a/include/msgpack/v1/object.hpp b/include/msgpack/v1/object.hpp
index fda54be9f..4fe1dca9a 100644
--- a/include/msgpack/v1/object.hpp
+++ b/include/msgpack/v1/object.hpp
@@ -1134,6 +1134,13 @@ inline typename std::enable_if<!msgpack::has_as<T>::value, T>::type object::as()
     return v;
 }
 
+template <typename T, typename C>
+inline typename std::enable_if<!msgpack::has_as<T>::value, T>::type object::as(const C & param) const {
+    T v;
+    convert(v, param);
+    return v;
+}
+
 #endif // defined(MSGPACK_USE_CPP03)
 
 inline object::object()
diff --git a/include/msgpack/v1/object_fwd.hpp b/include/msgpack/v1/object_fwd.hpp
index 2562b4164..051bb8e59 100644
--- a/include/msgpack/v1/object_fwd.hpp
+++ b/include/msgpack/v1/object_fwd.hpp
@@ -129,6 +129,9 @@ struct object {
     template <typename T>
     typename std::enable_if<!msgpack::has_as<T>::value, T>::type as() const;
 
+    template <typename T, typename C>
+    typename std::enable_if<!msgpack::has_as<T>::value, T>::type as(const C & param) const;
+
 #endif // defined(MSGPACK_USE_CPP03)
 
     /// Convert the object
@@ -145,6 +148,13 @@ struct object {
     >::type
     convert(T& v) const;
 
+    template <typename T, typename C>
+    typename msgpack::enable_if<
+        !msgpack::is_array<T>::value && !msgpack::is_pointer<T>::value,
+        T&
+    >::type
+    convert(T& v, const C& param) const;
+
     template <typename T, std::size_t N>
     T (&convert(T(&v)[N]) const)[N];