diff --git a/include/boost/graph/directed_graph.hpp b/include/boost/graph/directed_graph.hpp
index 585308d1..2c56a4e0 100644
--- a/include/boost/graph/directed_graph.hpp
+++ b/include/boost/graph/directed_graph.hpp
@@ -307,7 +307,7 @@ public:
 
     void swap(directed_graph& g)
     {
-        m_graph.swap(g);
+        m_graph.swap(g.m_graph);
         std::swap(m_num_vertices, g.m_num_vertices);
         std::swap(m_max_vertex_index, g.m_max_vertex_index);
         std::swap(m_num_edges, g.m_num_edges);