diff --git a/index.js b/index.js
index f991a80..7ad1c20 100644
--- a/index.js
+++ b/index.js
@@ -6,6 +6,6 @@ module.exports = {
 
   with: function() {
     var paths  = Array.prototype.slice.call(arguments);
-    return [].concat.apply([bourbon.includePaths], paths);
+    return [].concat.apply(bourbon.includePaths, paths);
   }
 };
diff --git a/test/with_test.js b/test/with_test.js
index 3baedf4..bed6136 100644
--- a/test/with_test.js
+++ b/test/with_test.js
@@ -1,5 +1,7 @@
-var sass    = require('node-sass')
-  , bourbon = require('../');
+const chai = require('chai');
+const assert = chai.assert;
+const sass = require('node-sass');
+const bourbon = require('../');
 
 function partialsDir(path) {
   return __dirname + '/fixtures/concat/' + path;
@@ -15,6 +17,11 @@ function errorHandler(err) {
 
 describe('#with function', function() {
 
+  it('should return an array of paths', function() {
+    assert.isArray(bourbon.with());
+    assert.isString(bourbon.with()[0], 'first #with function path');
+  });
+
   it('should concat string paths using #with', function(done) {
     sass.render({
       file: __dirname + '/fixtures/concat.scss',