diff --git a/lib/proto/parse-options.js b/lib/proto/parse-options.js
index 3679cb6..358b8ff 100644
--- a/lib/proto/parse-options.js
+++ b/lib/proto/parse-options.js
@@ -3,14 +3,13 @@
 var defaultSwitches = require("../switches")
 
 module.exports = function(options) {
-  this.options = options
-  this.options.elements = this.options.elements || "a[href], form[action]"
-  this.options.selectors = this.options.selectors || ["title", ".js-Pjax"]
-  this.options.switches = this.options.switches || {}
-  this.options.switchesOptions = this.options.switchesOptions || {}
-  this.options.history = this.options.history || true
-  this.options.analytics = (typeof this.options.analytics === "function" || this.options.analytics === false) ?
-    this.options.analytics :
+  options.elements = options.elements || "a[href], form[action]"
+  options.selectors = options.selectors || ["title", ".js-Pjax"]
+  options.switches = options.switches || {}
+  options.switchesOptions = options.switchesOptions || {}
+  options.history = options.history || true
+  options.analytics = (typeof options.analytics === "function" || options.analytics === false) ?
+    options.analytics :
     function() {
       if (window._gaq) {
         _gaq.push(["_trackPageview"])
@@ -19,20 +18,22 @@ module.exports = function(options) {
         ga("send", "pageview", {page: location.pathname, title: document.title})
       }
     }
-  this.options.scrollTo = (typeof this.options.scrollTo === "undefined") ? 0 : this.options.scrollTo;
-  this.options.cacheBust = (typeof this.options.cacheBust === "undefined") ? true : this.options.cacheBust
-  this.options.debug = this.options.debug || false
-  this.options.timeout = this.options.timeout || 0
-  this.options.scrollRestoration = (typeof this.options.scrollRestoration !== "undefined") ? this.options.scrollRestoration : true
+  options.scrollTo = (typeof options.scrollTo === "undefined") ? 0 : options.scrollTo;
+  options.scrollRestoration = (typeof options.scrollRestoration !== "undefined") ? options.scrollRestoration : true
+  options.cacheBust = (typeof options.cacheBust === "undefined") ? true : options.cacheBust
+  options.debug = options.debug || false
+  options.timeout = options.timeout || 0
 
   // we can’t replace body.outerHTML or head.outerHTML
   // it create a bug where new body or new head are created in the dom
   // if you set head.outerHTML, a new body tag is appended, so the dom get 2 body
   // & it break the switchFallback which replace head & body
-  if (!this.options.switches.head) {
-    this.options.switches.head = defaultSwitches.switchElementsAlt
+  if (!options.switches.head) {
+    options.switches.head = defaultSwitches.switchElementsAlt
   }
-  if (!this.options.switches.body) {
-    this.options.switches.body = defaultSwitches.switchElementsAlt
+  if (!options.switches.body) {
+    options.switches.body = defaultSwitches.switchElementsAlt
   }
+
+  this.options = options
 }