diff --git a/include/boost/mysql/async_handler_arg.hpp b/include/boost/mysql/async_handler_arg.hpp
index f00be70b..be8b93f0 100644
--- a/include/boost/mysql/async_handler_arg.hpp
+++ b/include/boost/mysql/async_handler_arg.hpp
@@ -2,6 +2,7 @@
 #define INCLUDE_BOOST_MYSQL_ASYNC_HANDLER_ARG_HPP_
 
 #include "boost/mysql/error.hpp"
+#include <type_traits>
 
 namespace boost {
 namespace mysql {
@@ -14,7 +15,7 @@ class async_handler_arg
 public:
 	using value_type = T;
 
-	constexpr async_handler_arg() noexcept = default;
+	constexpr async_handler_arg() = default;
 
 	constexpr async_handler_arg(error_info&& info):
 		err_(std::move(info)) {}
diff --git a/include/boost/mysql/error.hpp b/include/boost/mysql/error.hpp
index 89bf785d..4a9341f4 100644
--- a/include/boost/mysql/error.hpp
+++ b/include/boost/mysql/error.hpp
@@ -38,7 +38,7 @@ public:
 	error_info() = default;
 
 	/// Initialization constructor.
-	error_info(std::string&& err): msg_(std::move(err)) {}
+	error_info(std::string&& err) noexcept: msg_(std::move(err)) {}
 
 	/// Gets the error message.
 	const std::string& message() const noexcept { return msg_; }