diff --git a/containers.mllib b/containers.mllib
index 4706fe33..b7256789 100644
--- a/containers.mllib
+++ b/containers.mllib
@@ -4,10 +4,10 @@ Gen
 FHashtbl
 FQueue
 FlatHashtbl
-Graph
 Hashset
 Heap
 LazyGraph
+PersistentGraph
 PersistentHashtbl
 PHashtbl
 Sequence
diff --git a/containers.odocl b/containers.odocl
index 4706fe33..b7256789 100644
--- a/containers.odocl
+++ b/containers.odocl
@@ -4,10 +4,10 @@ Gen
 FHashtbl
 FQueue
 FlatHashtbl
-Graph
 Hashset
 Heap
 LazyGraph
+PersistentGraph
 PersistentHashtbl
 PHashtbl
 Sequence
diff --git a/graph.ml b/persistentGraph.ml
similarity index 100%
rename from graph.ml
rename to persistentGraph.ml
diff --git a/graph.mli b/persistentGraph.mli
similarity index 100%
rename from graph.mli
rename to persistentGraph.mli
diff --git a/tests/test_graph.ml b/tests/test_graph.ml
index bafc88e7..82116451 100644
--- a/tests/test_graph.ml
+++ b/tests/test_graph.ml
@@ -4,38 +4,40 @@
 open OUnit
 open Helpers
 
+module G = PersistentGraph
+
 (* build a graph from a list of pairs of ints *)
 let mk_graph l =
-  let g = Graph.empty 5 in
-  Graph.add_seq g
+  let g = G.empty 5 in
+  G.add_seq g
     (Sequence.map (fun (x,y) -> x,1,y)
       (Sequence.of_list l));
   g
 
 let test_copy () =
   let g = mk_graph [0,1; 1,2; 2,3; 3,0] in
-  let g' = Graph.copy g in
-  Graph.add g 1 1 3;
-  Graph.add g 1 2 3;
+  let g' = G.copy g in
+  G.add g 1 1 3;
+  G.add g 1 2 3;
   OUnit.assert_equal ~printer:print_int_list
-    [1;2] (List.sort compare (Sequence.to_list (Graph.between g 1 3)));
-  OUnit.assert_bool "copy" (Sequence.is_empty (Graph.between g' 1 3));
+    [1;2] (List.sort compare (Sequence.to_list (G.between g 1 3)));
+  OUnit.assert_bool "copy" (Sequence.is_empty (G.between g' 1 3));
   ()
 
 let test_roots () =
   let g = mk_graph [0,1; 1,2; 2,3; 4,1; 5,1; 6,5; 3,5] in
-  let roots = Sequence.to_list (Graph.roots g) in
+  let roots = Sequence.to_list (G.roots g) in
   OUnit.assert_equal (List.sort compare roots) [0;4;6]
 
 let test_leaves () =
   let g = mk_graph [0,1; 1,2; 2,3; 4,1; 6,5; 3,5; 3,7] in
-  let leaves = Sequence.to_list (Graph.leaves g) in
+  let leaves = Sequence.to_list (G.leaves g) in
   OUnit.assert_equal (List.sort compare leaves) [5;7]
 
 let test_dfs () =
   let g = mk_graph [0,1; 1,2; 2,3; 3,0; 1,4; 1,5; 5,6; 4,6; 6,0] in
   let l = ref [] in
-  Graph.dfs g 0 (fun (v,i) -> l := (v,i) :: !l);
+  G.dfs g 0 (fun (v,i) -> l := (v,i) :: !l);
   (* get index of vertex [v] in DFS traversal *)
   let get_idx v = List.assoc v !l in
   OUnit.assert_bool "order" (get_idx 0 < get_idx 1);
@@ -49,7 +51,7 @@ let test_dfs () =
 let test_bfs () =
   let g = mk_graph [0,1; 1,2; 2,3; 2,4; 3,0; 1,4; 1,5; 5,6; 4,6; 6,0] in
   let l = Sequence.to_list
-    (Sequence.mapi (fun i v -> (v,i)) (Graph.bfs_seq g 0)) in
+    (Sequence.mapi (fun i v -> (v,i)) (G.bfs_seq g 0)) in
   (* get index of vertex [v] in DFS traversal *)
   let get_idx v = List.assoc v l in
   OUnit.assert_bool "order" (get_idx 0 < get_idx 1);
@@ -71,8 +73,8 @@ and pp_edge formatter (v1,e,v2) =
 
 let test_dijkstra () =
   let g = mk_graph [0,1; 1,2; 2,3; 3,4; 3,0; 4,5; 1,5; 5,6; 4,6; 6,0] in
-  let path = Graph.min_path g ~cost:(fun x -> x) 0 6 in
-  let path = Graph.rev_path path in
+  let path = G.min_path g ~cost:(fun x -> x) 0 6 in
+  let path = G.rev_path path in
   OUnit.assert_equal ~printer:pp_path [0,1,1; 1,1,5; 5,1,6] path;
   ()