diff --git a/include/boost/graph/graph_concepts.hpp b/include/boost/graph/graph_concepts.hpp
index 90a7cb04..875f8184 100644
--- a/include/boost/graph/graph_concepts.hpp
+++ b/include/boost/graph/graph_concepts.hpp
@@ -469,10 +469,10 @@ typename T::ThereReallyIsNoMemberByThisNameInT vertices(T const&);
 
             const_constraints(g);
         }
-        void const_constraints(const Graph& g)
+        void const_constraints(const Graph& g_)
         {
             typedef typename property_map<Graph, vertex_index_t>::const_type Map;
-            Map m = get(vertex_index, g);
+            Map m = get(vertex_index, g_);
             ignore_unused_variable_warning(m);
         }
     private:
@@ -496,10 +496,10 @@ typename T::ThereReallyIsNoMemberByThisNameInT vertices(T const&);
 
             const_constraints(g);
         }
-        void const_constraints(const Graph& g)
+        void const_constraints(const Graph& g_)
         {
             typedef typename property_map<Graph, edge_index_t>::const_type Map;
-            Map m = get(edge_index, g);
+            Map m = get(edge_index, g_);
             ignore_unused_variable_warning(m);
         }
     private: