diff --git a/archive_exception.cpp b/archive_exception.cpp
index 4955d32..2215f4c 100644
--- a/archive_exception.cpp
+++ b/archive_exception.cpp
@@ -30,8 +30,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 namespace ns_archive {
 
-archive_exception::archive_exception(const std::string& what) noexcept :
-  _what(what)
+archive_exception::archive_exception(std::string&& what) noexcept :
+  _what(std::forward<std::string>(what))
 {
   //
 }
diff --git a/archive_exception.hpp b/archive_exception.hpp
index 1fcaa50..5c77ec4 100644
--- a/archive_exception.hpp
+++ b/archive_exception.hpp
@@ -37,7 +37,7 @@ namespace ns_archive {
 class archive_exception : public std::exception
 {
 public:
-  archive_exception(const std::string& what) noexcept;
+  archive_exception(std::string&& what) noexcept;
 
   const char* what() const noexcept override;