diff --git a/route.js b/route.js
index c365e1e..0a1fdea 100644
--- a/route.js
+++ b/route.js
@@ -11,11 +11,10 @@ var conversions = require('./conversions');
 	conversions that are not possible simply are not included.
 */
 
-// https://jsperf.com/object-keys-vs-for-in-with-closure/3
-var models = Object.keys(conversions);
-
 function buildGraph() {
 	var graph = {};
+	// https://jsperf.com/object-keys-vs-for-in-with-closure/3
+	var models = Object.keys(conversions);
 
 	for (var len = models.length, i = 0; i < len; i++) {
 		graph[models[i]] = {