diff --git a/include/wx/list.h b/include/wx/list.h
index edaa81b7a4..a62d9a4436 100644
--- a/include/wx/list.h
+++ b/include/wx/list.h
@@ -296,7 +296,7 @@ private:
             push_front( e );                                                  \
             return compatibility_iterator( this, begin() );                   \
         }                                                                     \
-        compatibility_iterator Insert( compatibility_iterator & i, elT e )    \
+        compatibility_iterator Insert(const compatibility_iterator &i, elT e) \
         {                                                                     \
             return compatibility_iterator( this, insert( i.m_iter, e ) );     \
         }                                                                     \