diff --git a/include/boost/move/detail/unique_ptr_meta_utils.hpp b/include/boost/move/detail/unique_ptr_meta_utils.hpp
index 4c6aeb5..27154e0 100644
--- a/include/boost/move/detail/unique_ptr_meta_utils.hpp
+++ b/include/boost/move/detail/unique_ptr_meta_utils.hpp
@@ -497,7 +497,7 @@ struct is_unary_function_impl<R (*)(T0)>
 {  static const bool value = true;  };
 
 template <typename R, class T0>
-struct is_unary_function_impl<R (*)(T0...)>
+struct is_unary_function_impl<R (*)(T0, ...)>
 {  static const bool value = true;  };
 
 #else // BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
@@ -519,7 +519,7 @@ struct is_unary_function_impl<R (__cdecl*)(T0)>
 {  static const bool value = true;  };
 
 template <typename R, class T0>
-struct is_unary_function_impl<R (__cdecl*)(T0...)>
+struct is_unary_function_impl<R (__cdecl*)(T0, ...)>
 {  static const bool value = true;  };
 
 #endif