diff --git a/libs/util/include/psemek/util/to_string.hpp b/libs/util/include/psemek/util/to_string.hpp
index 2573d01f..103f05fc 100644
--- a/libs/util/include/psemek/util/to_string.hpp
+++ b/libs/util/include/psemek/util/to_string.hpp
@@ -19,25 +19,21 @@ namespace psemek::util
 			return oss.str();
 		}
 
+		template <typename Char, typename Traits = std::char_traits<Char>>
+		struct to_string_impl
+		{
+			template <typename ... Args>
+			std::basic_string<Char, Traits> operator()(Args const & ... args) const
+			{
+				return detail::to_string<Char, Traits>(args...);
+			}
+		};
+
 	}
 
-	template <typename ... Args>
-	std::string to_string(Args const & ... args)
-	{
-		return detail::to_string<char>(args...);
-	}
-
-	template <typename ... Args>
-	std::wstring to_wstring(Args const & ... args)
-	{
-		return detail::to_string<wchar_t>(args...);
-	}
-
-	template <typename ... Args>
-	std::u32string to_u32string(Args const & ... args)
-	{
-		return detail::to_string<char32_t>(args...);
-	}
+	constexpr detail::to_string_impl<char> to_string;
+	constexpr detail::to_string_impl<wchar_t> to_wstring;
+	constexpr detail::to_string_impl<char32_t> to_u32string;
 
 	template <typename T, typename Char, typename Traits>
 	T from_string(std::basic_string<Char, Traits> const & s)