diff --git a/src/core.jl b/src/core.jl
index 1280046c3..38f4fdf52 100644
--- a/src/core.jl
+++ b/src/core.jl
@@ -33,6 +33,7 @@ type DiGraph
 end
 
 typealias SimpleGraph Union{Graph, DiGraph}
+typealias AbstractGraph SimpleGraph
 
 
 """Return the vertices of a graph."""