diff --git a/lib/express-helpers.js b/lib/express-helpers.js
index 6e06e53..d963770 100644
--- a/lib/express-helpers.js
+++ b/lib/express-helpers.js
@@ -1,6 +1,8 @@
-var express = require('express');
 module.exports = function(app) {
 	var helpers = {};
+	if (app) {
+		var express = require('express');
+	}
 	
 	helpers.HTML5 = "html5";
 	helpers.HTML4s = "html4s";