diff --git a/include/SFML/System/Utf.hpp b/include/SFML/System/Utf.hpp
index 36d7ae7da..d4eb8aaa4 100644
--- a/include/SFML/System/Utf.hpp
+++ b/include/SFML/System/Utf.hpp
@@ -38,12 +38,6 @@
 
 namespace sf
 {
-namespace priv
-{
-template <class InputIt, class OutputIt>
-OutputIt copy(InputIt first, InputIt last, OutputIt dFirst);
-}
-
 template <unsigned int N>
 class Utf;
 
diff --git a/include/SFML/System/Utf.inl b/include/SFML/System/Utf.inl
index bca49243f..2886663cb 100644
--- a/include/SFML/System/Utf.inl
+++ b/include/SFML/System/Utf.inl
@@ -41,15 +41,18 @@
 
 namespace sf
 {
+namespace priv
+{
 ////////////////////////////////////////////////////////////
 template <typename InputIt, typename OutputIt>
-OutputIt priv::copy(InputIt first, InputIt last, OutputIt dFirst)
+OutputIt copy(InputIt first, InputIt last, OutputIt dFirst)
 {
     while (first != last)
         *dFirst++ = static_cast<typename OutputIt::container_type::value_type>(*first++);
 
     return dFirst;
 }
+} // namespace priv
 
 
 ////////////////////////////////////////////////////////////