Index: undirected_graph.hpp
===================================================================
--- undirected_graph.hpp	(revision 61819)
+++ undirected_graph.hpp	(working copy)
@@ -94,7 +94,7 @@
     { }
 
     inline undirected_graph(undirected_graph const& x)
-        : m_graph(x), m_num_vertices(x.m_num_vertices), m_num_edges(x.m_num_edges)
+        : m_graph(x.m_graph), m_num_vertices(x.m_num_vertices), m_num_edges(x.m_num_edges)
         , m_max_vertex_index(x.m_max_vertex_index), m_max_edge_index(x.m_max_edge_index)
     { }