diff --git a/rib/rib.hpp b/rib/rib.hpp
index 70554e6..78ea766 100644
--- a/rib/rib.hpp
+++ b/rib/rib.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2016,  Regents of the University of California,
+ * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -46,6 +46,9 @@
   RibEntry::const_iterator route;
 };
 
+bool
+operator<(const RibRouteRef& lhs, const RibRouteRef& rhs);
+
 /** \brief represents the Routing Information Base
 
     The Routing Information Base contains a collection of Routes, each