diff --git a/include/boost/intrusive/detail/any_node_and_algorithms.hpp b/include/boost/intrusive/detail/any_node_and_algorithms.hpp
index 8b51099..455546c 100644
--- a/include/boost/intrusive/detail/any_node_and_algorithms.hpp
+++ b/include/boost/intrusive/detail/any_node_and_algorithms.hpp
@@ -280,7 +280,7 @@ class any_algorithms
       any_algorithms<VoidPointer>::template function_not_available_for_any_hooks<node_ptr>();
    }
 
-   static void swap_nodes(const node_ptr & l, const node_ptr & r)
+   static void swap_nodes(const node_ptr &, const node_ptr &)
    {
       //Any nodes have no swap_nodes capability because they don't know
       //what algorithm they must use to unlink the node from the container