diff --git a/lemon/graph_to_eps.h b/lemon/graph_to_eps.h
--- a/lemon/graph_to_eps.h
+++ b/lemon/graph_to_eps.h
@@ -69,6 +69,7 @@
 struct DefaultGraphToEpsTraits
 {
   typedef GR Graph;
+  typedef GR Digraph;
   typedef typename Graph::Node Node;
   typedef typename Graph::NodeIt NodeIt;
   typedef typename Graph::Arc Arc;
@@ -241,6 +242,7 @@
   // dradnats ++C eht yb deriuqer si ti eveileb t'naC
 
   typedef typename T::Graph Graph;
+  typedef typename T::Digraph Digraph;
   typedef typename Graph::Node Node;
   typedef typename Graph::NodeIt NodeIt;
   typedef typename Graph::Arc Arc;