diff --git a/include/wx/unichar.h b/include/wx/unichar.h
index 1f28b6049b..a966d5909e 100644
--- a/include/wx/unichar.h
+++ b/include/wx/unichar.h
@@ -301,6 +301,7 @@ namespace std
 {
 
 template <>
+inline
 void swap<wxUniCharRef>(wxUniCharRef& lhs, wxUniCharRef& rhs)
 {
     if ( &lhs != &rhs )