diff --git a/include/rexy/string_base.tpp b/include/rexy/string_base.tpp
index fce2717..cac97e6 100644
--- a/include/rexy/string_base.tpp
+++ b/include/rexy/string_base.tpp
@@ -204,8 +204,8 @@ namespace rexy{
 		m_r(std::forward<U>(r)){}
 	template<class Left, class Right>
 	constexpr string_cat_expr<Left,Right>::string_cat_expr(const string_cat_expr& s):
-		m_l(std::forward<Left>(s.m_l)),
-		m_r(std::forward<Right>(s.m_r)){}
+		m_l(s.m_l),
+		m_r(s.m_r){}
 	template<class Left, class Right>
 	constexpr string_cat_expr<Left,Right>::string_cat_expr(string_cat_expr&& s):
 		m_l(std::forward<Left>(s.m_l)),