diff --git a/include/msgpack/v1/object_fwd.hpp b/include/msgpack/v1/object_fwd.hpp
index 9c98a8f2..a932226a 100644
--- a/include/msgpack/v1/object_fwd.hpp
+++ b/include/msgpack/v1/object_fwd.hpp
@@ -59,7 +59,7 @@ private:
             decltype(adaptor::as<U>()(std::declval<msgpack::object>())),
             T
         >::type;
-    template <typename>
+    template <typename...>
     static std::false_type check(...);
 public:
     using type = decltype(check<T>(MSGPACK_NULLPTR));
diff --git a/include/msgpack/v2/object_fwd.hpp b/include/msgpack/v2/object_fwd.hpp
index 69286608..9c44aae6 100644
--- a/include/msgpack/v2/object_fwd.hpp
+++ b/include/msgpack/v2/object_fwd.hpp
@@ -91,7 +91,7 @@ private:
             v1::has_as<U>::value,
             std::true_type
         >::type;
-    template <typename>
+    template <typename...>
     static std::false_type check(...);
 public:
     using type = decltype(check<T>(MSGPACK_NULLPTR));
diff --git a/include/msgpack/v3/object_fwd.hpp b/include/msgpack/v3/object_fwd.hpp
index e8ab7e90..d282f1b4 100644
--- a/include/msgpack/v3/object_fwd.hpp
+++ b/include/msgpack/v3/object_fwd.hpp
@@ -51,7 +51,7 @@ private:
             v1::has_as<U>::value,
             std::true_type
         >::type;
-    template <typename>
+    template <typename...>
     static std::false_type check(...);
 public:
     using type = decltype(check<T>(MSGPACK_NULLPTR));