diff --git a/graph.rkt b/graph.rkt
index 832513a..2bf59c1 100644
--- a/graph.rkt
+++ b/graph.rkt
@@ -160,4 +160,4 @@
   (test-case "10 Graphviz"
     (define g (directed-graph '((a b) (b c))))
     (check-equal? (graphviz g)
-                  "digraph G {\n\tnode0 [label=\"c\"];\n\tnode1 [label=\"b\"];\n\tnode2 [label=\"a\"];\n\tsubgraph U {\n\t\tedge [dir=none];\n\t}\n\tsubgraph D {\n\t\tnode1 -> node0;\n\t\tnode2 -> node1;\n\t}\n}\n")))
+                  "digraph G {\n\tnode0 [label=\"c\"];\n\tnode1 [label=\"a\"];\n\tnode2 [label=\"b\"];\n\tsubgraph U {\n\t\tedge [dir=none];\n\t}\n\tsubgraph D {\n\t\tnode1 -> node2;\n\t\tnode2 -> node0;\n\t}\n}\n")))