diff --git a/P0959.md b/P0959.md
index c6a7862..8060c65 100644
--- a/P0959.md
+++ b/P0959.md
@@ -385,8 +385,8 @@ namespace std {
    template <class Elem, class Traits>
    std::basic_ostream<Elem, Traits> & operator<<(std::basic_ostream<Elem, Traits> &s, uuid const & id);
 
-   std::string to_string(uuid const & id);
-   std::wstring to_wstring(uuid const & id);
+   inline std::string to_string(uuid const & id);
+   inline std::wstring to_wstring(uuid const & id);
 }
 ```