diff --git a/cpp/graph.h b/cpp/graph.h
index f899b2789..934d57d6e 100644
--- a/cpp/graph.h
+++ b/cpp/graph.h
@@ -9,6 +9,8 @@
 
 #include <map>
 
+#define BOOST_NO_HASH  // to pacify the warnings about depricated headers in boost.graph
+
 #include <boost/graph/graph_traits.hpp>
 #include <boost/graph/adjacency_list.hpp>
 #include <boost/shared_ptr.hpp>