diff --git a/Mesh_3/include/CGAL/Mesh_3/C3T3_helpers.h b/Mesh_3/include/CGAL/Mesh_3/C3T3_helpers.h
index 538b687ced9..79163474bf2 100644
--- a/Mesh_3/include/CGAL/Mesh_3/C3T3_helpers.h
+++ b/Mesh_3/include/CGAL/Mesh_3/C3T3_helpers.h
@@ -69,7 +69,7 @@ public:
   }
 
 
-  Intrusive_list(const Intrusive_list& rhs)
+  Intrusive_list(const Intrusive_list& )
   {
     CGAL_assertion(false);
   }